1. An image generation system comprising: an expansion section which expands a series of first to N-th compressed textures included in compressed movie textures; and a texture mapping section which maps a series of first to N-th expanded textures sequentially onto an object, the series of first to N-th expanded textures being obtained by expanding the series of first to N-th compressed textures, wherein the texture mapping section maps the series of first to N-th expanded textures onto a first object in the order starting from the K-th expanded texture obtained by expanding the K-th compressed texture, and also onto a second object in the order starting from the L-th expanded texture obtained by expanding the L-th compressed texture.