A CPU 200 selects one or multiple image data GD to be pasted on ornamental image data among plurality of input image data GD and gains image processing control information GI related to the selected image data GD. The CPU 200 selects desired ornamental image data FD and gains layout control information LI related to the selected ornamental image data FD. The CPU 200 also reads image quality adjustment information GC included in the layout control information LI. The CPU 200 executes image quality adjustment of each of the selected image data GD with the image processing control information GI and the image quality adjustment information GC. The CPU 200 pastes the respective image data GD, which have gone through the image quality adjustment, on the ornamental image data FD according to the layout control information LI to generate resulting output image data.