| http://www.w3.org/ns/prov#value | - A node to be monitored at this time is a node with the real IP address set to an entry next to an entry in which a virtual IP address of the node is set, in the address management table 112A. Since the master node 110 is assumed to be node 1 here, in the example of an address management table 112A shown in FIG. 2, the master node 110 monitors a node with a node 2 real IP address (node 2).
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