An information processing system is provided to alleviate excessive load on a master node, thereby allowing the master node to efficiently perform the process of assigning jobs to nodes. A client 10 classifies a plurality of jobs constituting a large-scale arithmetic operation into several blocks, and requests a master node 20 to process the jobs block by block, such that the master node 20 always performs the process of assigning a predetermined number of jobs or less. Here, the predetermined number is preferably determined in such a manner as to allow the master node 20 to efficiently perform the process of assigning the jobs to nodes, even if the number of nodes is significant. As such, the client 10 has the function of controlling the load on the master node 20, and therefore it is possible to prevent the load on the master node 20 from increasing.