Patent ID: 8274367

Claim:
An RFID system provided with a plurality of processes, the system comprising: an antenna unit to detect a electro-magnetic wave transmitted by an RFID tag and read and write to a storage area of the RFID tag, the storage area including a first area to store ID information and a second area to store process identification information and command information corresponding to the process identification information; and a control unit including, a determination unit to determine whether or not the process identification information coincides with a number of its own process; an extraction unit to extract the command information corresponding to the process identification information from the second area when the determination unit determines that the process identification information coincides with the number of its own process; an execution unit to execute a process corresponding to the command information extracted by the extraction unit; and a writing unit to write a return value obtained by executing the process corresponding to the command information into the storage area of the RFID tag, wherein the writing unit writes the return value obtained by executing a process corresponding to a first command information extracted by the extraction unit in a first process of the plurality of processes into the storage area of the RFID tag, and the return value is read from the storage area of the RFID tag by the antenna unit in a second process after the first process and is used as a parameter for a process corresponding to second command information extracted by the extraction unit in the second process.