A method of editing a combined image which includes a plurality of object images. This editing method includes displaying an outline rectangle which forms outlines of one or more object images within the combined image, and 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, and alternatively, 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. After the segmenting or combining is performed, renewing displaying of the outline rectangle according the segmenting or combining result.