| 摘要 |
A virtual node ID control unit controls a virtual node ID that specifies a plurality of nodes as a single group. A status control unit controls node statuses that include information indicating the operating statuses of each individual node belonging to the group, and selects an operating mode that is either a priority mode. The local mode operates as an active node, or a standby mode, and the local mode operates as a standby node. A transmission/reception control unit controls the operation of the local node in accordance with the operating mode selected by the status control unit.
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