Building production information integration system

According to the invention, by developing a function of linking pieces of information of CAD's with one another for improving design drawings in quality, the pieces of information can be unified, the compatibility of information can be obtained or the efficiency of a collating operation can be improved and thereby data being compatible and good in quality which are made at an execution design stage can be obtained and a work of taking the compatibility can be advanced and further can be performed easily in a short time, and, therefore, such effects lead to shortening of the whole process and furthermore make it possible to comprehensively improve the efficiency of building production by diverting and utilizing said data at estimation and execution stages after the execution design stage. The invention provides an integrated building production information system comprising design CAD's based on software of building, structure and equipment, and databases built in the outside separately from these design CAD' s, said databases making an integrated DB-CAD system of building, structure and equipment as an execution-linked system in DB-CAD's sharing data of a standard database, wherein said integrated building production information system stores the information made compatible by three-dimensional superposition at the time of design into the shared database (DB) of the integrated DB-CAD system, and further receives and links information of this shared database to external systems such as a skeleton drawing CAD, a reinforcing bar and steel frame system and the like and makes execution information.