Patent ID: 8150370

Claim:
An authentication system comprising: an authentication server; a terminal device configured to be connected to said authentication server and be authenticated by said authentication server; a peripheral device configured to be connected to said terminal device; and a personal group management server configured to be connected to said terminal device, wherein said peripheral device transmits an identification data for identifying said peripheral device itself to said terminal device, said terminal device performs a first authentication on the basis of said identification data, and transmits an authentication data to said authentication server if said terminal device determines that said peripheral device is authenticated, and said authentication server performs a second authentication with respect to said peripheral device by using said authentication data, wherein said personal group management server relates said terminal device to a peripheral device which is authenticated in said first authentication of said terminal device so as to register and store as a personal group list, and transmits said personal group list to said terminal device, wherein said authentication server notifies a peripheral device which is authenticated of a personal group management server address which is an address of said personal group management server on said basis of said authentication data, said peripheral device transmits a peripheral device identifying data for identifying said peripheral device and a terminal device identifying data for identifying said terminal device to said personal group management server on said basis of said personal group management server address, and said personal group management server generates said personal group list by relating said peripheral device identifying data to said terminal device identifying data.