1. An image data processing apparatus comprising: image data generating means for generating image data; and processing means for processing the image data generated by said image data generating means, wherein said processing means includes a first image data receiving means for receiving the image data from said image data generating means and a second image data receiving means for receiving the image data from said image data generating means, said first and second image data receiving means receiving the respective image data substantially at the same time while said second image data receiving means receives image data different in data type from the image data received by said first image data receiving means.