To provide a communication apparatus that can decrease the communication cost so as to effectively utilize network resources.

A WAN node 200 at a transmitter side applies multiplex processing to data and transmits the multiplexed data, which have substantially been sent through virtual channels VC1-VC6, through one virtual channel VC1. Furthermore, a WAN node 210 at a receiver side demultiplexes the multiplexed data received via the virtual channel VC1 so as to process the data as if the data were transmitted through the separate virtual channels VC1-VC6.