Abstract: Method and apparatus for totally managing sets of construction-related information relating to constructional relationship between each product to be produced and its component parts, and sets of production-related information relating to production of the products, wherein the sets of construction- and production-related information are determined as respective subjects which can be similarly processed and which are classified into classes on the basis of extracted mutual relationships of the subjects, and a set of subject data incorporating mutually related sets of element data including subject substance data and relationship substance data which indicate substances of each subject and the relationships is stored by a data storing device operated by a user, in a production information memory from which the set of subject data is retrieved and outputted by an output device.