To improve convenience of a data carrier system, a cellular phone (30) which is carried by a user and includes an RFID communication unit (36) reading identification information of an RFID from the RFID in the vicinity in a non-contact state contains a user correlation unit (311) counting the number of times of reading with respect to identification information which have been read, selecting at least one carrier identification information from the identification information which have been read, and correlating the at least one carrier identification information with the user.