An image forming apparatus includes a forming unit configured to form a set of reference patches corresponding to different density regions through an image forming unit while making the reference patches correspond to screen types, an input unit configured to input a comparison result between each of the reference patches and criterial patches having densities as criteria at each of the screen types, and a generation unit configured to generate information for correcting a density of an image formed by the image forming unit at each of the screen types by using the comparison result input by the input unit, wherein the information generated by the generation unit for correcting an image in a highest density region from among the density regions is commonly generated according to the comparison result input with respect to each of the reference patches formed at each of the screen types.