COMMUNICATION APPARATUS

1 . A communication apparatus in a communication system that includes a plurality of communication apparatuses of an active system and a standby communication apparatus of a standby system, the communication apparatus comprising:

a communicator configured to transmit and receive communication apparatus information including information related to the communication apparatus to and from the other communication apparatuses; and

a controller configured to compare a degree of impact on communication of the communication apparatus with a degree of impact on communication of each of the other communication apparatuses based on the communication apparatus information, and to start, when the degree of impact of the communication apparatus is determined to be high, synchronization processing that transmits synchronization data to be used in operation to the standby communication apparatus.

2 . The communication apparatus according to claim 1 , wherein the controller periodically executes the comparing.

3 . The communication apparatus according to claim 1 ,

wherein the communication apparatus information includes a number of terminal devices under the communication apparatus, and

wherein the controller determines that a degree of impact of the communication apparatus is high when the number of terminal devices under the communication apparatus is greater than a number of terminal devices under the other communication apparatus.

4 . The communication apparatus according to claim 3 ,

wherein the communication apparatus information includes a numerical value related to traffic volume of the communication apparatus, and

wherein, in a case where a second communication apparatus is included in the other communication apparatus, the second communication apparatus having an equal number of terminal devices under the second communication apparatus to a number of terminal devices under the communication apparatus, the control unit determines that a degree of impact of the communication apparatus is high when the traffic volume of the communication apparatus is greater than traffic volume of the second communication apparatus.

5 . The communication apparatus according to claim 1 , wherein the standby communication apparatus replaces the communication apparatus, and is switched to serve as an active system when the standby communication apparatus detects that a failure has occurred in the communication apparatus.

6 . The communication apparatus according to claim 1 , wherein the synchronization data includes data generated when communication with a terminal device under the communication apparatus is established.

7 . The communication apparatus according to claim 1 , wherein the synchronization data includes data generated when an event occurs.

8 . The communication apparatus according to claim 1 , wherein the synchronization data includes data generated only once when operation starts.

9 . The communication apparatus according to claim 1 ,

wherein the communication system includes a second controller that manages the active system and the standby system, and

wherein, when the controller determines that a degree of impact of the communication apparatus is high, the controller notifies the second controller of the determination.

10 . A communication system comprising:

a plurality of communication apparatuses of an active system; and

a standby communication apparatus of a standby system,

wherein each of the communication apparatus transmits and receives communication apparatus information including information related to the communication apparatus to and from the other communication apparatuses, compares a degree of impact on communication of the communication apparatus with a degree of impact on communication of each of the other communication apparatuses based on the communication apparatus information, and starts, when the degree of impact of the communication apparatus is determined to be high, synchronization processing that transmits synchronization data to be used in operation to the standby communication apparatus, and

wherein the standby communication apparatus receives the synchronization data in the synchronization processing, replaces, when the standby communication apparatus detects that a failure has occurred in the communication apparatus that has transmitted the synchronization data, the communication apparatus that has transmitted the synchronization data, and is switched to serve as an active system.