Data transmission apparatus selecting efficient network or service class

A method of transmitting data from a user terminal device through a plurality of networks to a destination, said user terminal device executing communication using an Internet protocol, said method comprising the steps of:

• storing information relating a destination address of the data and addresses of the plurality of networks in a routing table;
• storing static and dynamic information about the plurality of networks in an information table;
• and
• selecting one or the plurality of networks, through which the data is transmitted to the destination, based on said static and dynamic information.

A transmission apparatus transmitting data received from a user terminal through a plurality of networks to a destination, said user terminal executing communication using an Internet protocol, said transmission apparatus comprising:

• means for storing information relating a destination address of the data and addresses of the plurality of networks;
• means for stet storing static and dynamic information about the plurality of networks;
• and
• means for selecting at least one of the plurality of networks, through which said transmission apparatus transmits the data to the destination, based on said static and dynamic information.