1. A device comprising: an obtaining unit configured to obtain a color value of each of a plurality of pixels included in an input image, a unit configured to determine whether an additional image is combined with the input image; a correction unit configured to correct the each color value of the plurality of pixels by using a correction value corresponding to the additional image in a case where the additional image is determined to be combined with the input image; and a class determination unit configured to determine a class of color amount for calculating a printing fee of the input image based on the obtained each color value of the plurality of pixels in a case where the additional image is not determined to be combined with the input image, and determine a class of color amount for calculating a printing fee of the input image based on the corrected color value in a case where the additional image is determined to be combined with the input image.