An image division unit divides an original image. Each divided image is assigned an identifier, and additional information for generating an image corresponding to each divided image. An image distribution unit transmits the divided image and a reference drawing to a corresponding image generation terminal device. The image generation terminal device displays the reference drawing, generates an image corresponding to the received divided image, and transmit the generated image to an image distribution device. The image generation unit generates an entire image by integrating images received from a plurality of image generation terminal devices.