Determining communication history of users

1. A first communication terminal, comprising:

a first display device;

a memory configured to store computer-executable instructions; and

one or more processors configured to execute the computer-executable instructions to:

acquire, from a second communication terminal, a first information code that includes connection information to connect to a communication service of an external device and first identification information of a first user of the second communication terminal;

transmit, based on the acquired first information code, the first identification information of the first user of the second communication terminal and second identification information of a second user of the first communication terminal to the external device;

generate, based on the acquired first information code, second information that includes a second information code and the second identification information; and

control the first display device to display the second information code, wherein a third communication terminal acquires the displayed second information code by capture of a first image of the displayed second information code.

2. The first communication terminal according to claim 1 ,

wherein the one or more processors are further configured to control a camera to capture a second image to acquire the first information code.

3. The first communication terminal according to claim 1 , wherein the one or more processors are further configured to propagate the generated second information to the third communication terminal.

4. The first communication terminal according to claim 1 , wherein the connection information includes address information of the external device and third identification information of the communication service.

5. The first communication terminal according to claim 1 , wherein the connection information includes:

an identifier of an access point connected to the communication service; and

authentication information to connect to the access point.

6. The first communication terminal according to claim 1 , wherein the one or more processors are further configured to acquire meta-information of content on the communication service from the second communication terminal.

7. The first communication terminal according to claim 6 , wherein the meta-information of the content includes at least one of a name of the content or an artist name of the content.

8. The first communication terminal according to claim 1 , wherein the one or more processors are further configured to control a playback duration of content on the communication service based on an instruction from the second communication terminal.

9. The first communication terminal according to claim 1 , wherein the second communication terminal includes a second display device that displays the first information code.

10. The first communication terminal according to claim 1 , wherein the first information code corresponds to a Quick Response (QR) code.

11. The first communication terminal according to claim 1 , wherein the connection information includes at least one of event information or propagator identification information.

12. An information processing device, comprising:

a memory configured to store computer-executable instructions; and

one or more processors configured to execute the computer-executable instructions to:

receive, from a first communication terminal, first identification information of a first user of a second communication terminal and second identification information of a second user of the first communication terminal,

wherein the first communication terminal receives connection information of a communication service and the first identification information from the second communication terminal,

wherein the first communication terminal generates second information that includes a second information code and the second identification information,

wherein the first communication terminal displays the second information code, and

wherein a third communication terminal acquires the displayed second information code by capture of an image of the displayed second information code;

generate, based on the first identification information and the second identification information, a social graph that indicates a first relationship between the first user of the second communication terminal and the second user of the first communication terminal;

update the social graph based on the connection information of the communication service; and

transmit the updated social graph to each of a plurality of terminals and each of the first communication terminal, the second communication terminal, and the third communication terminal.

13. The information processing device according to claim 12 ,

wherein the one or more processors are further configured to:

receive, from the third communication terminal, the second identification information of the second user of the first communication terminal and third identification information of a third user of the third communication terminal,

wherein the third communication terminal receives the connection information of the communication service and the second identification information from the first communication terminal; and

update the social graph with a first graph that indicates a second relationship between the second user of the first communication terminal and the third user of the third communication terminal.

14. A communication method, comprising:

in a first communication terminal:

acquiring, from a second communication terminal, a first information code that includes connection information to connect to a communication service of an external device and first identification information of a first user of the second communication terminal;

transmitting, based on the acquired first information code, the first identification information of the first user of the second communication terminal and second identification information of a second user of the first communication terminal to the external device;

generating, based on the acquired first information code, second information that includes a second information code and the second identification information; and

controlling a display device of the first communication terminal to display the second information code, wherein a third communication terminal acquires the displayed second information code by capture of an image of the displayed second information code.

15. An information processing method, comprising:

in an information processing device:

receiving, from a first communication terminal, first identification information of a first user of a second communication terminal and second identification information of a second user of the first communication terminal,

wherein the first communication terminal receives connection information of a communication service and the first identification information from the second communication terminal,

wherein the first communication terminal generates second information that includes a second information code and the second identification information,

wherein the first communication terminal displays the second information code, and

wherein a third communication terminal acquires the displayed second information code by capture of an image of the displayed second information code;

generating, based on the first identification information and the second identification information, a social graph that indicates a relationship between the first user of the second communication terminal and the second user of the first communication terminal;

updating the social graph based on the connection information of the communication service; and

transmitting the updated social graph to each of a plurality of terminals and each of the first communication terminal, the second communication terminal, and the third communication terminal.

16. A non-transitory computer-readable medium having stored thereon computer-executable instructions which, when executed by a processor of a first communication terminal, cause the processor to execute operations, the operations comprising:

acquiring, from a second communication terminal, a first information code that includes connection information to connect to a communication service of an external device and first identification information of a first user of the second communication terminal;

transmitting, based on the acquired first information code, the first identification information of the first user of the second communication terminal and second identification information of a second user of the first communication terminal to the external device;

generating, based on the acquired first information code, second information that includes a second information code and the second identification information; and

controlling a display device of the first communication terminal to display the second information code, wherein a third communication terminal acquires the displayed second information code by capture of an image of the displayed second information code.

17. A communication system, comprising:

a first communication terminal that comprises:

a display device;

a first memory configured to store first set of computer-executable instructions; and

a first set of one or more processors configured to execute the first set of computer-executable instructions to:

acquire, from a second communication terminal, a first information code that includes connection information to connect to a communication service of an external device and first identification information of a first user of the second communication terminal;

transmit, based on the acquired first information code, the first identification information of the first user of the second communication terminal and second identification information of a second user of the first communication terminal to the external device;

generate, based on the acquired first information code, second information that includes a second information code and the second identification information; and

control the display device to display the second information code, wherein a third communication terminal acquires the displayed second information code by capture of a first image of the displayed second information code; and

an information processing device that comprises:

a second memory configured to store a second set of computer-executable instructions; and

a second set of one or more processors configured to execute the second set of computer-executable instructions to:

receive, from the first communication terminal, the first identification information of the first user of the second communication terminal and the second identification information of the second user of the first communication terminal,

wherein the first communication terminal receives connection information of the communication service and the first identification information from the second communication terminal, and

generate, based on the first identification information and the second identification information, a social graph that indicates a relationship between the first user of the second communication terminal and the second user of the first communication terminal;

update the social graph based on the connection information of the communication service; and

transmit the updated social graph to each of a plurality of terminals and each of the first communication terminal, the second communication terminal, and the third communication terminal.