Patent ID: 8477938

Claim:
An authentication method of a portable electronic device, the authentication method comprising: (1) at the portable electronic device which requires authentication for utilizing a predetermined application and does not include a communication function for directly performing communication connection with authentication center or service provider, transmitting a system serial number stored previously to a mobile communication terminal connected by wire and wirelessly; (2) at the mobile communication terminal, encoding the system serial number received from the portable electronic device and an authentication key previously stored in the mobile communication terminal, generating an integration secrete key, performing communication connection with an authentication center computer, and transmitting the integration secrete key to the authentication center computer; (3) at the authentication center computer, decoding the integration secrete key received from the mobile communication terminal, performing authentication registration, encoding a temporary service approval key which can be used by the portable electronic device and a temporary integration authentication key for approving relay of the mobile communication terminal, and transmitting the temporary service approval key and the temporary integration authentication key to the mobile communication terminal; (4) at the mobile communication terminal, decoding the temporary integration authentication key received from the authentication center computer, obtaining approval for the relay of the mobile communication terminal, encoding the temporary service approval key, and transmitting the temporary service approval key to the portable electronic device; (5) at the portable electronic device, decoding the temporary service approval key received from the mobile communication terminal, performing authentication for utilizing a service, and applying the temporary service approval key to an application desired by a user to utilize the service; and (6) at the portable electronic device, if receiving a call over the mobile communication terminal while a predetermined application is utilized by the portable electronic device, displaying information that the call is being received on a screen and performing a multitasking process which allows a user to continuously utilize the application while a telephone conversation is made over the mobile communication terminal.