A database stores a plurality of image data to which the shooting date is attached. A list displaying unit displays on a display device a list of thumbnail images of the image data. An instruction receiving unit acquires a thumbnail image as a specified image. An image classifying unit generates one or a plurality of groups of images by classifying the plurality of image data in terms of the year when the image data were shot. A representative image selector acquires, as a representative image of each image group, image data having a shooting month-day identical to or close to the shooting month-day of the image data corresponding to the specified image from each image group. The list displaying unit displays a list of the each image group for each year and displays the representative image placed at the head of each image group.