A process control unit (41) causes a plurality of control-target processes to operate in a memory area of a size equal to or smaller than a limiting value x. When a stopping process is detected, a resource allocation unit (43) allocates a size of a usable memory area for each of the control-target processes as a relaxed limiting value. When the stopping process is detected, the process control unit (41) causes each of the control-target processes to perform fallback operation in a memory area of a size equal to or smaller than the relaxed limiting value allocated to the process by the resource allocation unit (43).