1. An information processing apparatus, comprising: a memory configured to store images in a plurality of groups, each group associated with a plurality of images and a predetermined event category and having associated therewith a representative image from the plurality of images; a first display unit implemented by one or more processing circuits and configured to display, in a horizontal band across a screen, thumbnail images for each group, wherein each thumbnail image displayed in the horizontal band is a representative image for the group to which the thumbnail image belongs; a selection unit implemented by the one or more processing circuits configured to receive a selection of one of the thumbnail images to select a group; and a second display unit implemented by the one or more processing circuits and configured to display, in a vertical band on the screen, additional thumbnail images of the plurality of images included in the group selected by the selection unit, the vertical band intersecting the horizontal band such that the selected one of the thumbnail images is included in both the vertical band and the horizontal band, wherein, in an event a user of the information processing apparatus switches from a first thumbnail image to a second thumbnail image at the intersection of the horizontal band and the vertical band, the additional thumbnail images of the plurality of images included in the group to which the second thumbnail image belongs are displayed in the vertical band.