A printing method for performing poster printing in a printing system comprising a plurality of printing apparatuses, the printing method includes dividing original image data to be printed into a plurality of divided image data, assigning each of the divided image data to two or more printing apparatuses among the plurality of the printing apparatuses, acquiring print dimension accuracy information of each of the printing apparatuses assigned with the divided image data, performing dimension correction on a part or all of the divided image data corresponding to the printing apparatus assigned with each of the divided image data based on the acquired print dimension accuracy information, and performing printing by the printing apparatus assigned with the divided image data based on the divided image data that underwent the correcting step.