A defacement degree determination apparatus according to one embodiment of the invention includes an alignment unit which aligns positions of an input image from one printed material printed using a plurality of printing plates with registered images registered in advance, a plate separation processing unit which separates the input image into a plurality of printed components corresponding to the plurality of printing plates, and extracts defacement features from the respective printed components, and a defacement degree determination unit which determines a defacement degree of the printed material based on the defacement features extracted from the respective printed components.