Electronic device for displaying message and operating method thereof

1. An electronic device, comprising:

a display,

a processor, and

a memory storing historical messages previously transceived by the electronic device, and instructions executable by the processor to cause the electronic device to:

based on reception of an unread new message different from all the stored historical messages, control the display to display a notification indicating the reception of the unread new message on a first screen,

detect an input corresponding to the notification,

based on the input corresponding to the notification, control the display to display the unread new message on a second screen at a first time point in absence of any of the stored historical messages, and

control the display to display at least one historical message from among the stored historical messages on the second screen at a second time point, after a designated time elapses from the first time point while maintaining display of the unread new message,

wherein the second time point is later than the first time point.

2. The electronic device of claim 1 ,

wherein the second screen corresponds to a message application screen.

3. The electronic device of claim 1 ,

wherein the unread new message is displayed at a top portion of the second screen at the first time point, and

wherein the unread new message is displaced to a bottom portion of the second screen at the second time point.

4. The electronic device of claim 1 , wherein the instructions are further executable by the processor to cause the electronic device to:

apply a graphic effect highlighting the unread new message when the unread new message is displayed at the first time point.

5. The electronic device of claim 4 , wherein the graphic effect highlighting the unread new message is applied to at least one of the unread new message and a background area of the second screen.

6. The electronic device of claim 4 , wherein the instructions are further executable by the processor to cause the electronic device to: remove the graphic effect at a third time point occurring after at least one of the first time point and the second time point.

7. The electronic device of claim 1 , wherein the unread new message is received as part of a transmission of a plurality of unread new messages distinct from the stored historical messages, and

wherein the instructions are further executable to cause the electronic device to:

select a first unread new message from among the plurality of unread new messages,

control the display to display the first unread new message at a third time point, and

control the display to additionally display the at least one historical message and/or another unread new message from among the plurality of unread new messages at a fourth time point, after a designated time elapses from the third time point.

8. The electronic device of claim 7 , wherein the first unread new message is selected from among the plurality of unread new messages based at least on content included in each of the plurality of unread new messages and the stored historical messages.

9. The electronic device of claim 1 , wherein the first screen corresponds to a lock screen displayed when the electronic device is operating in a locked state,

wherein the instructions are further executable by the processor to cause the electronic device to execute a lock release operation based on the detected input corresponding to the notification, and

wherein the unread new message and the at least one historical message are displayed after execution of the lock release operation.

10. The electronic device of claim 9 , wherein the instructions are further executable by the processor to cause the electronic device to:

control the display to display a message associating release of the locked state of the electronic device based on the detected input,

wherein the lock release operation is executed based on a lock release input received after displaying the message.

11. An operation method of an electronic device, the method comprising:

storing in a memory historical messages previously transceived by the electronic device and previously read by a user;

based on reception of an unread new message different from all the stored historical messages, displaying on a first screen a notification indicating reception of the unread new message;

detecting by a processor an input corresponding to the notification;

based on the input corresponding to the notification, displaying the unread new message on a second screen at a first time point in absence of any of the stored historical messages; and

displaying at least one historical message from among the stored historical messages on the second screen at a second time point, after a designated time elapses from the first time point while maintaining display of the unread new message,

wherein the second time point is later than the first time point.

12. The method of claim 11 ,

wherein the second screen corresponds to a message application screen.

13. The method of claim 11 ,

wherein the unread new message is displayed at a top portion of the second screen at the first time point, and

wherein the unread new message is displaced to a bottom portion of the second screen at the second time point.

14. The method of claim 11 , wherein displaying the unread new message includes applying a graphic effect highlighting the unread new message when the unread new message is displayed at the first time point.

15. The method of claim 14 , wherein the graphic effect highlighting the unread new message is applied to at least one of the unread new message and a background area of the second screen.

16. The method of claim 11 , wherein the unread new message is received as part of a transmission of a plurality of unread new messages different from the stored historical messages, and

wherein the method further comprises:

selecting a first unread new message from among the plurality of unread new messages;

displaying the first unread new message as selected at a third time point; and

displaying the at least one historical message and/or another unread new message from among the plurality of unread new messages at a fourth time point, after a designated time elapses from the third time point.

17. The method of claim 16 , wherein the first unread new message is selected from among the plurality of unread new messages based at least on content included in each of the plurality of unread new messages and the stored historical messages.

18. The method of claim 11 , wherein the first screen corresponds to a lock screen displayed when the electronic device is operating in a locked state, the method further comprising:

executing a lock release operation based on the detected input corresponding to the notification,

wherein the unread new message and the at least one historical message are displayed after execution of the lock release operation.