The present invention provides a method and a device for controlling a multicore processor by selecting and operating the appropriate number of cores corresponding to an operation state of the processor. In a multicore processor having a plurality of cores each independently performing a calculation process on one processor, an operating rate of a thread or task of each core within a predetermined time is calculated by summing the operating times or the number of operating times within a predetermined time, and an overall operating rate of all the cores is found by summing the calculated operating rates. The number of operating cores corresponding to the overall operating rate is determined by a previously set table. The number of cores operating has a hysteresis characteristic in which the number of operating cores is different between increasing and decreasing times of the overall operating rate. Operating cores corresponding to the number of the determined cores are selected by the previously set table. When an exceptional process is detected, all the cores operate. After a predetermined time, when it is determined that the exceptional process is eliminated, the process returns to the original processing.
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