a design pattern correcting method of correcting a design pattern in relation to a minute step of the design pattern , is disclosed , which comprises extracting at least one of two edges extended from a vertex of the design pattern , measuring a length of the extracted edge , determining whether or not the length of the measured edge is shorter than a predetermined value , extracting two vertexes connected to the extracted edge if it is determined that the length of the extracted edge is shorter than the predetermined value , and reshaping the design pattern to match positions of the two extracted vertexes with each other .