A graphics processing unit is provided. A basic model display processing unit generates and displays rendering data based on three-dimensional model information on an object to be rendered. An effect model processing unit performs processing for applying a predetermined effect to a three-dimensional model of the object. A basic model storing unit stores a basic model file which defines a basic form of the object. An effect model storing unit stores an effect model file which describes the effect to be applied to the basic model in order to create a variation form while maintaining the identity of the basic form of the object. An effect processing unit applies the effect described in the effect model file to the basic model of the object, thereby changing the basic model. A rendering unit performs graphics processing for displaying a variation of the object based on the basic model changed.