To provide the secure environment by solving the problem wherein the contents are probably used by others in spite of permission to use the contents given to one household because it is unknown that what kind of information terminals are connected to the contracted one information terminal or how many information terminals are connected to the contracted one information terminal.
All sub terminals registered with a main terminal are managed by a sub terminal management unit 5 of a host device 200, and the contents can be downloaded to the only reliable home network by confirming right of the registration/registration-erasure processing on the basis of the personal identification information when getting the contract, which is managed in the main terminal contract management unit 36.
KAGEYAMA MITSUHIRO
TSUKIDATE RIYOUTA
KITATORA HIROTO
Tomoyasu Sakaguchi
Hiroki Naito
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