A power controlling circuit is assigned to each of a plurality of power domains of which power may be on/off-controlled, and which have a first hierarchical structure included in a semiconductor device, and these power controlling circuits are connected in accordance with a second hierarchical structure corresponding to the first hierarchical structure, and thereby, a power management unit controlling power supply to the plurality of power domains is configured, as a result that the power management unit performing power supply control depending on power control specification may be designed easily.