Control method and semiconductor integrated circuit

A semiconductor integrated circuit comprising:

• a clock controller that generates a clock;
• and
• a plurality of blocks that operates by using the clock,
• wherein the clock controller performs a statistical processing for the plurality of blocks, controls a frequency of the clock to a first frequency, changes the frequency of the clock from the first frequency to a second frequency, generates the clock of which the frequency is changed from the second frequency to the first frequency after a time predicted by the statistical processing as a time for which the second frequency is to be continued elapses from a timing when the frequency of the clock is changed to the second frequency, and supplies the generated clock to the plurality of blocks,
• and wherein the clock controller generates the clock changed to a third frequency obtained by decimating down the second frequency from the first frequency according to a time for which the first frequency is to be continued and the time for which the second frequency is to be continued after the frequency of the clock is changed from the second frequency to the first frequency, and supplies the generated clock to the plurality of blocks.