Patent ID: 7123604

Claim:
A mobile computer device capable of carrying out communications while moving over inter-connected networks, the mobile computer device comprising: a registration message transmission unit for transmitting a registration message containing an information on a current location of the mobile computer device, from outside a home network of the mobile computer device to a mobile computer management device located at the home network, the mobile computer management device having a function for managing the information on the current location of the mobile computer device and transferring packets destined to the mobile computer device to the current location of the mobile computer device; a user input unit for accepting a user input for user authentication; and a user-input-based information transmission unit for transmitting to the mobile computer management device a response message containing information based on the user input as a user authentication information, when a challenge message that requests returning of the user authentication information is received from the mobile computer management device in response to the registration message and the mobile computer management device is judged as proper.