Communication system with mobile terminal accessible to mobile communication network and local network simultaneously

摘要

In a communication system using a mobile terminal capable of accessing both a mobile communication network and a local network simultaneously and a gateway provided between a fixed communication network and the local network, the mobile terminal transmits an inquiry message for inquiring information regarding a location on networks of a correspondent of packet communications, to the gateway through the local network, and receives a response message indicating the lookup processing result from the gateway through the local network. Then, the mobile terminal acquires an address to be used in the packet communications with the correspondent according to the response message, and assigns the address to a communication interface for the local network.