1. A photographing device comprising: a photographing unit; an image processor which separates an object from a first photographing image obtained by the photographing unit; a display which displays a background live view obtained by superimposing the separated object on a live view of a background; and a controller which obtains a second photographing image corresponding to the live view of the background when a command to shoot the background is input, and generates a composite image based on the separated object and the second photographing image, wherein the controller controls the image processor to restore a shape of the separated object by adding a restoration area of the object, the restoration area being not included in the first photographing image and not overlapping with an area of the separated object, and superimposes the separated object having the restored shape on the live view of the background.