Two image processing systems and an image processing method are provided. One of the image processing systems includes a first unit configured to output a portion of input image data, a second unit configured to transform a coordinate of input image data, and a third unit configured to output the image data processed by the first unit and the second unit as video data to be displayed on a display. The other one of the image processing system further includes a fourth unit configured to combine input image data of a plurality of images to output one piece of image data. The image processing method includes outputting a portion of input image data, transforming a coordinate of input image data, and outputting the image data as video data to be displayed on a display.