The disclosure discloses a RFID tag information system comprising a transmission/reception antenna configured to carry out information transmission/reception via radio communication with a RFID circuit element; an access information processing device configured to carry out predetermined processing relating to information for access that accesses the RFID circuit element or access acquisition information; and a selection processing portion for select and process one transmission path among a plurality of transmission paths that transmit the information for access from the access information processing device or that transmit the access acquisition information to the access information processing device.