A search table acquisition unit preliminarily acquires a search table, which is a list of RFID tags attached to items of equipment. A tag search unit searches for the RFID tags, a comparison processing unit compares an RFID tag having responded with tag information in the search table and, for an RFID tag which has become unresponsive, a re-search processing unit 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.