An RFID tag having a double-read prevention function is enabled to respond in the event of having become unresponsive during communication. A search table acquisition unit (2) preliminarily acquires a search table, which is a list of RFID tags (7) attached to items of equipment. A tag search unit (4) searches for the RFID tags (7), a comparison processing unit (5) compares an RFID tag (7) having responded with tag information in the search table and, for an RFID tag (7) which has become unresponsive, a re-search processing unit (6) performs a process of disabling the double-read prevention function, thereby enabling the RFID tag to respond. Accordingly, it becomes possible to reliably inspect items of equipment provided properly.
