Patent ID: 8073382

Claim:
A communication apparatus, comprising: detection means for detecting whether or not externally input user personal information has been stored in a storage medium; communicative means for transmitting request information that requests related information about contents included in received broadcast information, the communicative means transmitting a transmission of available/unavailable request information identifying a broadcast station that broadcast the received broadcast information, if said detection means detects that said externally input user personal information is not stored in said storage medium, the communicative means receiving available/unavailable information in a reply to the transmission of said available/unavailable request information, the available/unavailable information showing whether or not an external device offers a service providing said related information about the contents, the communicative means transmitting said externally input user personal information to the external device to request a user registration in accordance with said available/unavailable information, if said detection means detects that said externally input user personal information is not stored in said storage medium, wherein said detection means stores said externally input user personal information in said storage medium, if said detection means detects that said externally input user personal information is not stored in said storage medium.