Methods, devices and computer-readable mediums providing chat service

1. A method of providing a chat service between a first device and a plurality of second devices, the method comprising:

creating a first chat room to display first visual signs transmitted between the first device and the plurality of second devices;

receiving a command to select one or more of the plurality of second devices while the first chat room is displayed on the first device;

selecting the one or more of the plurality of second devices based on the command;

creating a second chat room to display second visual signs transmitted between the first device and the selected one or more of the plurality of second devices;

merging only a subset of the second visual signs displayed in the second chat room with the first visual signs displayed in the first chat room; and

displaying, in sequence, the merged visual signs in the first chat room based on transmission or reception times of the merged visual signs, wherein

the merging and the displaying are based on permission received from at least one of the selected one or more of the plurality of second devices,

the subset of the -second visual signs includes a first portion of the second visual signs for which the permission is received and does not include a second portion of the second visual signs for which the permission is not received,

the subset of the second visual signs includes only second visual signs permitted by the at least one of the selected one or more of the plurality of second devices to be merged with the first visual signs displayed in the first chat room, and

the subset of the second visual signs includes less than all of the second visual signs displayed in the second chat room.

2. The method of claim 1 , wherein

the command is a command to select one or more of the first visual signs displayed in the first chat room; and

the selecting selects, as the one or more of the plurality of second devices, one or more of the plurality of second devices having transmitted the selected one or more of the first visual signs.

3. The method of claim 2 , further comprising:

displaying the selected one or more of the first visual signs in the second chat room.

4. The method of claim 1 , further comprising:

displaying, in the second chat room, the first visual signs transmitted by the selected one or more of the plurality of second devices.

5. The method of claim 1 , further comprising:

displaying, on a single screen after the creating of the second chat room, first visual signs created in the first chat room and second visual signs created in the second chat room.

6. The method of claim 1 , further comprising:

discriminatively displaying, on a single screen after the creating of the second chat room, first visual signs created in the first chat room and second visual signs created in the second chat room.

7. The method of claim 1 , further comprising:

transmitting, based on the permission received from the at least one of the selected one or more of the plurality of second devices, the second visual signs displayed in the second chat room to one or more of the plurality of second devices not participating in the second chat room.

8. The method of claim 1 , further comprising:

storing, in an electronic file, at least one of the first visual signs displayed in the first chat room or the second visual signs displayed in the second chat room.

9. The method of claim 1 , further comprising:

closing the second chat room when the first chat room is closed.

10. The method of claim 1 , wherein the merging merges the subset of the second visual signs with the first visual signs in the first chat room such that the first visual signs and the subset of the second visual signs are shared with the first device and the plurality of second devices in the first chat room.

11. A method of providing a chat service between a first device and a plurality of second devices, the method comprising:

creating a first chat room configured to display first visual signs transmitted between the first device and a first set of the plurality of second devices;

creating a second chat room configured to display second visual signs transmitted between the first device and a second set of the plurality of second devices;

creating a third chat room, merging only a subset of the first visual signs displayed in the first chat room and the second visual signs displayed in the second chat room; and

displaying, in sequence, the merged visual signs in the third chat room based on transmission or reception times of the merged visual signs, wherein

the merging and the displaying are based on permission received from at least one device of the first set of the plurality of second devices and the second set of the plurality of second devices,

the subset of the first visual signs displayed in the first chat room and the second visual signs displayed in the second chat room includes only visual signs permitted by the at least one device of the first set of the plurality of second devices and the second set of the plurality of second devices,

the subset of the first visual signs includes a first portion of the first visual signs for which the permission is received and does not include a second portion of the first visual signs for which the permission is not received, and

the subset of the first visual signs includes less than all of the first visual signs displayed in the first chat room.

12. The method of claim 11 , further comprising:

discriminatively displaying, in the third chat room, first visual signs created in the first chat room and second visual signs created in the second chat room.

13. The method of claim 11 , wherein the displaying comprises:

displaying, in the third chat room, visual signs transmitted between the first device, the first set of the plurality of second devices, and the second set of the plurality of second devices.

14. A non-transitory computer-readable recording medium having recorded thereon a program that, when executed by a computer, causes the computer to perform the method of claim 1 .

15. A non-transitory computer-readable recording medium having recorded thereon a program that, when executed by a computer, causes the computer to perform the method of claim 11 .