To enable coordinate values of a deformed part to be automatically converted to normal coordinate values when converting coordinate data of mounting data to program data.

A table which conventionally shows only the correspondence between parts specification names and mounting parts codes is changed to one which describes mounting coordinate data, normal coordinate data, and the offsets. The new table is called a parts specification name-code corresponding table 60 and prepared in advance for each manufacturer. When changing the coordinates, coordinate data which show the mounting positions of deformed parts having different dimensional methods between the manufacturers are converted to coordinate data which show the mounting positions according to the reference of each manufacturer while correcting the data using the corresponding table.