The present application provides a system which transmits a request signal to a plurality of chips located within a communication range of an antenna, receives from a chip which has received the request signal an answer back including identification information and a plurality of error detection codes of the chip, generates a plurality of error detection codes from the identification information of the chip, detects match or mismatch of a plurality of error detection codes received and a plurality of error detection codes generated, and when, among a plurality of pairs of the error detection codes, match of a pair of error detection codes is detected and mismatch of another pair of error detection codes is detected, determines that the match of the pair of the error detection codes of the chip is misrecognition resulting from collision of a response signal.