The present invention provides a technique for further improving the processing efficiency in accordance with the setting of the number of waits in a semiconductor device that arbitrates data transfer through a bus between a plurality of bus masters and a plurality of bus slaves. A semiconductor device includes a clock supplying unit that independently supplies clocks to a plurality of bus slaves and a plurality of bus masters. The number of waits in accordance with an operating frequency can be set for each bus slave such as a memory. As the setting of the number of waits becomes smaller, the clock supplying unit improves the operating frequency by controlling a phase difference between the clocks supplied to the bus masters and the bus slaves in accordance with the number of waits set for each bus slave.