1. A rendering method comprising: generating, using a processor, a plurality of clone objects corresponding to a predetermined object having a motion in 3D space to which a motion blur effect is to be applied, based on information of the predetermined object illustrated by graphics data; setting transparency of each of the generated clone objects; and rendering the 3D graphics data including the generated plurality of clone objects having the set transparency to a buffer, wherein transparency of the portion where the clone objects overlap from the rendering results, is different from the set transparency, and wherein the number of generated clone objects is predetermined.