An apparatus includes multiple image processing units configured to execute image processing on input data, which are connected in serial, and include two or more image processing units having the same image processing function. The image processing units include a transfer unit configured to transfer input first data to a next image processing unit without changing the data, and an image processor configured to execute image processing on the first data to output second data. At least one of the image processing units transfers the first data to the next image processing unit without changing the first data when the first data is input, and also outputs the second data.