An intermediate command generation unit generates intermediate commands, which are intermediate rendering commands having model data for rendering an object. A graphics command conversion unit converts the generated intermediate commands into a graphic command sequence for execution by a graphics processor. An identity determination unit determines whether a state of a graphics command to be generated from an intermediate command is the same as a state of the graphics command generated previously. A graphics command generation unit generates a graphics command determined by the identity determination unit as not having the same state, and does not generate a graphics command determined as having the same state, defining the command as a redundant command.