Equipment to prevent spoofing in an authentication technique that uses a portable terminal and the like, includes an authentication unit for performing personal authentication of the user, a communication unit for communicating with a register, and an authentication control unit for permitting the authentication unit to execute the personal authentication of the user when receiving authentication start instructing information from the register connected to the communication unit. Spoofing is difficult to carry out because the authentication start instructing information must be received from the register in order to perform the required personal authentication prior to the post-authentication communication.