Data display device, integrated circuit, data display method, data display program and a recording medium

A data display device for displaying, on a display unit, a group of images related to a plurality of pieces of file data comprises: an operation unit operable to receive, from a user, a display operation pertaining to the group of images related to the pieces of file data; a storage unit storing cluster information on clusters that are generated by grouping the pieces of file data according to a grouping condition; and a control unit operable to display, on the display unit, the group of images related to the pieces of file data so that the user can distinguish between clusters, in accordance with the display operation received by the operation unit and with the cluster information stored in the storage unit.