To effectively suppress the power consumption of the whole system by positively generating inactive processors even in a state where the number of tasks is over that of processors.

In this information processing system, OS previously knows the resource request quantity of the processors 11 and 12 of the processing unit of each task including OS itself to centralize the group of tasks to the specific processor 11 within a range in which the resources of the processors 11 and 12 are not short (a range in which the sum of the request quantity of the processor resources is not over 100). Thereby, the other processor 12 is brought into an inactive state so that power source supply for the inactive processor is stopped or a clock frequency is lowered. Thereby the power consumption of the whole system is effectively suppressed.