1. A power consumption control method for a multicore CPU containing a plurality of cores individually receiving electricity and occupying a certain number of banks in a main storage as a working area, the main storage having a plurality of banks individually receiving electricity, by which a core which is being enabled to transition to a power save mode cuts off supply of electricity to the core itself, another core creates a suspend image of the working area occupied by the core transitioning to the power save mode and stores the suspend image into a bank of the working area, and making, by the another core, the bank of the working area being used for storing the suspend image to enter a self refresh mode and cutting off supply of electricity to each remaining bank of the working area.