摘要 |
PROBLEM TO BE SOLVED: To restrain interferences between radio channels of different communication networks when two kinds of terminals capable of communicating with each other constitute a communication network including a radio channel, respectively.SOLUTION: A communication network system comprises a first communication network NT1 including a radio channel and a plurality of second communication networks NT2, each including a radio channel. A first terminal 10 is a node belonging to the first communication network NT1 and uses a radio channel to communicate. A second terminal 20 is a node belonging to one of the second communication networks NT2 and uses a radio channel to communicate. The first terminal 10 and the second terminal 20 communicate with each other. The second terminal 20 includes a selection unit 22 which selects a frequency used in the second communication network NT2 to which it belongs and a determination unit 23 which, upon receiving selection information from the first terminal 10, determines a frequency to be used in the second communication network NT2 to which it belongs and indicates it to the selection unit 22. |