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