Image processing according to a sensation expression can be carried out regardless of differences in output media or viewing conditions. An editing instruction for image data is generated by editing instruction means in a personal computer according to a sensation expression such as "sharpness" or "softness". At this time, the content of image processing is corrected and according to a characteristic of a monitor of the personal computer by input condition setting means and displayed on the monitor. The result of the editing instruction is transferred to a laboratory as a general sensation expression script. In the laboratory, image processing is carried out on image data according to the general sensation expression script. At this time, output condition setting means changes the degree of image processing according to the characteristic of an output medium for processed image data and the like. The processed image data are then output by output means to the predetermined output medium.