1. A three-dimensional object data processing method comprising: a step of storing at least one piece of three-dimensional object data into a first storage unit; a first extraction step of extracting objects included in a space relevant to rendering from the first storage unit; and a step of grouping the extracted objects into a group, associating the objects with the group and projecting the grouped object data onto an eyepoint dependent plane to generate two-dimensional texture data representing the group, and storing the texture data in a second storage unit associating the texture data with the group.