To indicate correction quantities individually with conductor widths, properties, etc., of respective patterns while greatly shortening the operation time of correction processing of CAD data through automation.

In a correction processing system for printed wiring board manufacture data as an embodiment of the present invention automatically, information regarding pattern design specifications included in design data is made to be generated by analyzing the CAD data (design data) first. Then, it is constituted so that correction information can be received through a user interface. The information regarding the pattern design specifications is generated as an electronic document in which information regarding an annular ring and information regarding a line aperture are listed up by layers and which is provided with a field for inputting the correction information. Further, batch correction processing of the design data is carried out according to the received correction information.