An apparatus, system, and method for judging a movement direction of an RFID tag in a case where read information acquired from a first region and read information acquired in a second region which overlap the first region indicate that the RFID tag has moved out of a part of the first region which part does not overlap the second region. The described embodiments include a movement direction judging section, a detection frequency information acquisition section, a movement judging section, an output judging section, and an output section.