CAD SYSTEM FOR DESIGNING PREFABRICATED BUILDING

PROBLEM TO BE SOLVED: To provide a CAD system which can reduce the number of drawings to be referred is reduced, can facilitate the treatment of the drawings, and also can reduce a mistake in drawing when the working drawings of a prefabricated building are prepared. SOLUTION: This system is provided with plan drawing preparing CAD 1 for preparing a plan drawing of a room layout based on inputted plan information, working drawing preparing means (respective designing means 131-134) for preparing working drawings which express information concerning a structural skeleton such as the fit of a panel based on the plan drawing prepared by the CAD 1 and a working drawing editing means (information managing means 136) for extracting data concerning an installation object to be installed to the structural skeleton from among the plan drawing prepared by the CAD 1 for preparing the plan drawing and displaying it on the working drawing which is prepared by the working drawing preparing means.