The present invention includes a plurality of computing units executing a plurality of threads including a communication control thread to which a receiving process by polling is assigned. In a CPU core, a computing unit executing the communication control thread performs polling in a memory region indicating notification of arrival of data and waits for execution of the receiving process until arrival of data, and when a computing unit executing an application thread executes a process assigned to the application thread, the computing unit executing the communication control thread moves to a resource-saving mode in which the use of physical resources is suppressed.