An information processing system includes a master node and a plurality of cluster nodes managed by the master node, and stores a node list having set a transfer sequence of the request information sent from the master node to the cluster nodes. The cluster nodes accept the request information to transfer the same to the next transfer destinations according to the node list or to the master node if the next transfer destinations do not exist. The master node sends the request information to one of the cluster nodes according to the node list, and divides the plurality of cluster nodes into a cluster node group positioned under the management of the master node and another cluster node group positioned under the management of a predetermined cluster node according to the time interval after sending the request information until receiving the request information from other cluster nodes.