To facilitate selection of a display manner in a display device capable of displaying an image(s) based on a plurality of image signals, the display device according to the present invention includes: a video inputter including a plurality of input terminals configured to acquire a plurality of image signals including image data to be displayed by a display unit; a detector configured to detect characteristics of the image signals; a group determinator configured to classify the image signals into at least one group based on the characteristics detected by the detector; and an output control unit configured to output information indicating a display mode of the display unit associated with at least one group.