An electronic device according to an embodiment of the present document may comprise a camera, a distance sensor, a display, and a processor. The processor can: acquire an image including a subject by means of the camera; acquire distance data about the distance between the subject and the electronic device by means of the distance sensor; determine the occurrence of defocusing on the basis of the distance data; sense an area of interest, including at least part of the subject, in the image; crop an area, including at least the area of interest, in the image; and enlarge and display the cropped area on the display along with a message indicating the defocusing.