1. An image compositing apparatus that composites images together into a final composite image, the images including a video image and a plurality of graphical images, the image compositing apparatus comprising: first obtaining means that obtains the graphical images and composition information including an image compositing order, the composition information being used for calculating a composition ratio of each of the images to the final composite image; first compositing means that composites the graphical images to generate one composite graphical image according to the composition information; calculating means that calculates a composition ratio of the video image to the final composite image according to the composition information; second obtaining means that obtains frames of the video image; and second compositing means that composites one of the obtained frames at a time with the composite graphical image using the composition ratio of the video image.