A communication apparatus comprises a destination obtainer that obtains a destination
address, a telephone network interface that connects to a public switched telephone
network and a LAN interface that connects to an Internet. Further the communication
apparatus includes a communication controller, an Internet communication controller
and a network communication controller. The communication controller analyzes the
destination address obtained by the obtainer to determine whether communication
is performed via the telephone network interface or via the LAN interface. The
Internet communication controller performs voice transmission over the Internet
via the LAN interface when the communication controller determines that the communication
is performed via the LAN interface and the network communication controller performs
voice transmission over the public switched telephone network via said telephone
network interface.
