The electronic device according to an embodiment includes: a camera; a display; a memory storing one or more instructions; and a processor configured to execute the one or more instructions stored in the memory to: determine a size of a wall surface to be photographed to be output to an image display apparatus; control the display to display, on a preview image, a guideline indicating a region corresponding to the size of the wall surface to be photographed, based on a distance between the electronic device and the wall surface; control the camera to capture an image indicating the wall surface, based on the output guideline; and transmit the captured image to the image display apparatus such that the captured image is output to the image display apparatus.