1. An image processing apparatus for executing predetermined image processing on an original image that is based on image signals supplied, the image processing apparatus comprising: display means for displaying a plurality of adjusting images each corresponding to a part or the entirety of the original image; setting means for setting values of a plurality of parameters defining respective degrees of the image processing for the adjusting images such that the values differ among the plurality of adjusting images; and operating means for specifying one of the plurality of adjusting images by an external operation; wherein when one of the plurality of adjusting images is specified using the operating means, the setting means, with reference to the degree of the image processing for the specified adjusting image, modifies the values of the plurality of parameters defining the respective degrees of the image processing for the other adjusting images so that the values for the other adjusting images are approximated to the values for the specified adjusting image, and the display means displays the adjusting images according to the respective degrees of the image processing modified by the setting means.