A portable terminal has an authenticator for biometric authentication, and a TPM for storing biometric information of a user necessary when performing authentication processing with the authenticator and a secret key generated for the biometric information. At the time of initialization of an OS, the portable terminal transmits a request for a registration cancelation using a registration cancelation URL to a server in which registration information including a public key which is a pair with a secret key is registered. When an authentication request for the registration cancelation is received from the server, a signature is generated using the secret key extracted according to an authentication success in the biometric authentication of the authenticator using the biometric information read by the biometric information sensor, when the signature is successfully verified by being transmitted to the server, the registration cancelation of the registration information is performed in the server.