A display control unit executes control to display images requested to be rendered, including effects in a plurality of formats and of a plurality of kinds according to rendering requests, on a display medium via a GPU by using effect data in which the amounts of data have been reduced in accordance with the rendering frequencies of the effects. Specifically, the display control unit determines the amount of data to be reduced for an effect in a format and of a kind according to a rendering request in accordance with the rendering frequency of the effect, extracts the effect data in which data has been reduced by the amount of data from effect-data storage DBs, and provides the effect data to the GPU.