Patent ID: 7250864

Claim:
A tag unit reading/writing apparatus comprising: a wireless communications section for radio-communicating with a tag unit including at least two RFID tags, each tag comprising an antenna and an IC chip that includes a tag transmission/reception section and a tag storage section, the storage sections of the respective RFID tags storing a unique ID information different from each other; a reading part for reading the ID information from the tag storage sections of the respective RFID tags in the tag unit through said wireless communications section; a storing part for storing ID information identical to the ID information in the respective RFID tags before reading one from the RFID tags, relating the ID information one to another; a comparing part for comparing the respective ID information read from the RFID tags by said reading part with the respective ID information being related to each other previously stored by the storing part; and a judging part for judging that the tag unit is reusable if a number of matching of the IDs is more than or equal to a predetermined number.