Communication apparatus, relay apparatus, communication system, communication method, and communication program

摘要: A communication apparatus has a plurality of interfaces serving networks. The selects an interface according to electric wave reception intensity reduce power consumption and contribute the maintenance reliability in communication. (communication terminal apparatus, other party's apparatus) is used for such way that apparatuses are connected networks wirelessly carry out through each network. (cellular CI, WLAN WI) responding also controlling unit (power supply unit) connects any one actuate interface, on rest response state change connection from rest. changes while maintaining with apparatus.