READING APPARATUS AND CALLING APPARATUS AND ID READING PROGRAM AND ID READING METHOD

The present invention is directed to locate easily an unread IC tag (a commodity attaching the IC tag), upon failing to read the IC tag. An invoice storing unit 14 of the gate type RFID apparatus 10 stores a tag ID of the IC tag to be read by the gate side reader/writer apparatus 11. The gate side reader/writer apparatus 11 reads a tag ID from each IC tag attached to a plurality of commodities. A read data storing unit 12 stores the tag ID read by the gate side reader/writer apparatus 11. A comparator 13 specifies a tag ID which has failed to be read by the gate side reader/writer apparatus 11, based on the tag ID stored on the invoice storing unit 14 and the tag ID stored on the read data storing unit 12. The comparator 13 transmits the specified tag ID to the handy type RFID apparatus 20. The handy type RFID apparatus 20, based on this tag ID, searches the IC tag which has failed to be read by the gate side reader/writer apparatus 11, based on this tag ID.