1. A method of editing a combined image comprising a plurality of object images, the method comprising: displaying an outline rectangle which forms outlines of an object image within the combined image; when a predetermined first operation is performed on an object image selected from among the object images located within the outline rectangle, segmenting the selected object image and another object image located within the outline rectangle; when a predetermined second operation is performed on an object image selected from among the object images located within the outline rectangle, combining the selected object image with another object image located within an outline rectangle other than the outline rectangle; and renewing displaying of the outline rectangle according the segmenting or combining.