COMMUNICATION TERMINAL, COMMUNICATION SYSTEM AND NODE SWITCHING METHOD

PROBLEM TO BE SOLVED: To obtain a communication terminal which is capable of preventing communication from being disabled, when a failure occurs in connection with a node, without using any control frame between nodes. SOLUTION: The present invention relates to a communication terminal 2 which is connected to nodes 1-1, 1-2, uses any one of the nodes 1-1, 1-2 as a communication node for performing communication and performs communication while switching the connection node to be used as the communication node. The communication terminal 2 comprises: a link monitoring unit 12 for detecting a failure in the nodes 1-1, 1-2 or a failure in links 4-1, 4-2; a transmitting/receiving unit 11 which switches the communication node when any failure is detected, and transmits communication data to the communication node after switching; and a broadcast frame transmitting unit 13 which transmits, when the communication node is switched, a broadcast frame with an address of the terminal's own as a transmission source address to the communication node after switching. COPYRIGHT: (C)2011,JPO&INPIT