A printing support system that supports performing a printing process on the basis of document data allowing paper width and paper height to be set for each of a plurality of pages includes: a document data acquisition unit that acquires the document data; a finish paper size information acquisition unit that acquires finish paper size information indicating finish paper width and finish paper height of a printed material; a normalization rule storage unit that stores a plurality of normalization rules used to process the document data such that paper widths and paper heights of entire pages of the document data are adapted to the finish paper width and finish paper height of the finish paper size information; a normalization rule selection unit that selects the normalization rules in the normalization rule storage unit on the basis of the paper width and paper height of the document data acquired by the document data acquisition unit and the finish paper width and finish paper height of the finish paper size information acquired by the finish paper size information acquisition unit; and a document data processing unit that processes the document data acquired by the document data acquisition unit on the basis of the normalization rule selected by the normalization rule selection unit.