Patent ID: 8218506

Claim:
A terminal device using a plurality of wireless communication systems, the device comprising: a transmission path quality acquisition unit that acquires: a first transmission path quality of a first wireless communication system, which is a wireless communication system being used; and a second transmission path quality of a second wireless communication system, which is a wireless communication system to be used; a switching criterion determination unit that determines a plurality of switching criterions, wherein each of the plurality of switching criterions is determined based on all of the first transmission path quality, the second transmission path quality, and a communication method of the first wireless communication system; and a switching decision unit that decides whether to switch from the first wireless communication system to the second communication system, based on the determined switching criterion, wherein, when the communication method of the first wireless communication system is a predefined wireless communication method, the switching criterion determination unit determines that either a fast transmission switching criterion or a slow transmission switching criterion is employed based on a communication throughput of the second wireless communication system.