1. A method for correcting image rendering data, comprising: preparing image rendering data having position coordinates that determine an image rendering region, and base position coordinates that show a position of a base point arranged in the image rendering region; obtaining a displacement state of position coordinates on an image rendering object; correcting the base position coordinates based on the displacement state of position coordinates on the image rendering object; and correcting the position coordinates of the image rendering region based on the base position coordinates, while a shape of the image rendering region is maintained.