Communication system, communication device and communication method

摘要

In a communication system which communicates between communication apparatuses by using a transmission path in which a bandwidth varies, a plurality of communication lines are grouped into a plurality of multiplex groups based on priorities of data to be transmitted. The communication system includes a detecting section configured to detect a variation of the bandwidth of said transmission path; and a closing section configured to close or release said communication lines of each of said plurality of multiplex groups based on the detected variation.