It is an object of the present invention to provide a display device with which a photographing state of image data can be intuitively known. When a subject is photographed, a quadrangular flag mark representing a photographing point of an image, and a triangular mark and a circular mark of solid lines representing a photographing range, are displayed on a map. A user can download a desired image associated with the marks by clicking the marks. When a subject is not photographed, a triangular flag mark representing the photographing point of the image, and triangular marks and circular marks of broken lines, are displayed on the map. The user can upload necessary images on the basis of the marks.