Electronic device having flexible display and image-capturing method according to changes in state of same

An electronic device comprising:

• a camera;
• a display;
• memory storing instructions;
• and
• at least one processor, wherein the instructions, when executed by the at least one processor, cause the electronic device to:
• in response to a user input for executing video capturing, capture a video,
• display a screen of the captured video obtained through the camera, based on a first resolution of the display,
• detect a change of a resolution of the display, while performing the video capturing,
• display a screen of the captured video obtained through the camera, based on a second resolution of the display according to the detected change of the resolution of the display,
• identify a hidden area of the captured video, the hidden area being a portion of the captured video which is not displayed in the screen of the captured video based on the first resolution of the display, and
• generate an adjusted video by processing the captured video using information of the identified hidden area, and
• store the captured video and the adjusted video.