A device that is communicably connected to each of three or more nodes constituting a cluster system holds resource information, which is information relating to a resource used by an application, in relation to each of the three or more nodes. The device receives resource condition information indicating variation in the condition of the resource from each node, updates the resource information on the basis of the received resource condition information, determines a following active node on the basis of the updated resource information, and notifies at least one of the three or more nodes of the determined following active node.