[Challenge] To prevent the invasion of privacy to be performed based on the unique identifier is read. [MEANS FOR SOLVING PROBLEMS] Variable other than the one (SA1), and start previously when providing individual users false RFID transmitter for transmitting false identifier disturbance and (RFID) against infringers, it receives a transmission command of the RFID from the tag reader I transmit an RFID different every time (SA3~SA5), even though it is the same person sent the fake RFID type. Each false RFID transmitter are grouped into a plurality of types, false RFID transmitter to each other belong to the same group is the probability of transmitting a false RFID common that match each other while calling a fake RFID variable type of its own has increased. By providing individual users each false RFID transmitter by specifying the area for each group, and the appearance of the case the RFID of the same is transmitted while a person different. [Selection Figure 11
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