Disclosed is a display device characterized by comprising a frame having a ring shape and mounted on a user and a display unit arranged along the frame over substantially its entire circumference. The display device comprises a controller having judgment means for judging which position is the position where the display unit is arranged in relation to another display unit on the basis of a signal from a receiver, storage means for storing positional information in the judgment means, and display control means for controlling the display of the display unit on the basis of the positional information stored in the storage means. Further, disclosed is a display system comprising the display device and a communication unit for communicating with the display device.