Patent ID: 7031276

Claim:
A communication system, comprising: a mobile terminal device capable of accessing both a mobile communication network and a local network simultaneously; and a gateway device provided between a fixed communication network and the local network; the mobile terminal device having: an identification information notification unit configured to notify a device identification information of the mobile terminal device and a mobile carrier identification information of a mobile carrier to which the mobile terminal device belongs, to the gateway device, at a time of accessing the fixed communication network from the local network through the gateway device; and a user response notification unit configured to notify a user response indicating user's acceptance or refusal of an accounting condition notified from the gateway device, to the gateway device; and the gateway device having: an accounting condition notification unit configured to notify the accounting condition for the mobile terminal device to access the fixed communication network through the gateway device when the device identification information notified from the mobile terminal device is not registered at the gateway device in advance, to the mobile terminal device; and a user message notification unit configured to notify a message indicating the device identification information and the mobile carrier identification information notified from the mobile terminal device, and a fact that a user of the mobile terminal device as identified by the device identification information and the mobile carrier identification information has accepted a payment of a fee according to the accounting condition to a fixed communication network provider through the mobile carrier identified by the mobile carrier identification information, to a fixed communication network side, when the user's response indicating user's acceptance of the accounting condition is notified from the mobile terminal device.