An information processing apparatus includes a first function block which controls rendering and a second function block which controls operation modes of the first function block. The rendering is finally performed in a display unit. The second function block shifts the operation mode to a power-saving mode in the first function block when the first function block completes generation of a screen to be rendered before completion of a unit rendering period, namely, a frame period. In the event of start of next unit rendering period, the second function block, on the other hand, shifts the power-saving mode back to a normal mode in the first function block, based on a vertical synchronizing signal indicative of the start of next unit rendering period.