Patent ID: 8115601

Claim:
A control device capable of controlling a second RFID tag reader capable of using at least one of first unit radio channels available for a first RFID tag reader and at least one of second unit radio channels not available for the first RFID tag reader, the control device comprising: a radio channel control portion for assigning a unit radio channel used for transmission and reception with an RFID to the second RFID tag reader; and a carrier sense control portion for receiving information indicative of a received radiowave strength in each of unit radio channels measured by the second RFID tag reader, storing information indicative of availability of each of the unit radio channels based on the information indicative of the received radiowave strength, wherein the radio channel control portion determines whether any one of the second unit radio channels is available based on the information indicative of availability of each of the unit radio channels, determines whether any one of the first unit radio channels is available in a case in which it is determined that any one of the second unit radio channels is not available, and assigns a unit radio channel for transmission and reception to the second RFID tag reader based on the result of the determinations.