1. A detection stabilizing apparatus for an RFID system, comprising: a detecting means for detecting a movement quantity of an object to be detected within a detection area; and a detection stabilization processing means for, based upon said detected movement quantity of the object to be detected within the detection area, stabilizing a detection result of information output by an ID holding unit that holds and outputs ID information of the object to be detected, in which said ID holding unit is attached to or held by the object to be detected.