Patent ID: 7734919

Claim:
An information processing terminal comprising: a communication processing unit for performing a communication operation with respect to an appliance having been connected with the information processing terminal through a network, wherein said communication processing unit includes an authenticating operation operable both where the authenticating operation is performed before communication, and where the authenticating operation is performed responsive to a request for authentication; and a signature calculating unit in which when a communication with respect to said appliance is carried out and authentication is needed, a signature using a secret key for authenticating an appropriate operator for the information processing terminal is produced by a calculation processing unit provided within the signature calculating unit; wherein: said communication processing unit transmits information attached with the signature produced by the signature calculating unit to said appliance; said information processing terminal further comprising an appliance authentication verifying unit configured to receive a message with a signature back from the appliance, and to verify authentication of the user of the appliance via the message with the signature; communication between the information processing terminal and the appliance is allowed if authentication is accepted at the appliance and the information processing terminal; and before a telephone communication calling process operation to said appliance is commenced, said telephone communication processing unit transmits said information attached to the signature to said appliance.