A device includes, a search controlling information storing unit that stores, for each searching purpose, the search controlling information indicating whether or not the search is to be proceeded for the kinds of parts between the interfaces in the parts is defined and registered, a set information collecting unit that decides the interface of the parts to be searched, according to the search controlling information for each search object, from both the design information of the system constitution diagram and the registered information of the library database of the parts and the interfaces, and traces the connection relations of the interfaces thereby to collect the set information of the searched parts and the interfaces from the library database of the design information of the system constitution diagram, the parts and so on.