An electronic device comprises a display having a display area, a size of the display area visually exposed in a first state is reduced and a size of the display area visually exposed in a second state is enlarged, and a processor, the processor configured to acquire state information of the electronic device, successively display a first and a second preview images on the display, based on the state information of the electronic device, the first preview image includes a first area of a specified image and corresponds to a preview image of a background screen in the first state, the second preview image comprises a second area including the first area and a further area extending from the first area, and corresponds to a preview image of a background screen in the second state, and specify the image as a background screen, based on a first user input.