In order to produce high quality final products cheaply using a large-scale production chains, not just the production being performed in the present production unit, but also parts supplies chains must be rational and without waste or overburdening. However, there is presently no means for discovering whether parts supplies chains are irrational, without waste or overburdening, or are rational and without waste or overburdening.A hierarchical tree table of product-parts lists of multi-stages may be displayed with at least one item of parts supply information, this being selected out of production unit of the parts, number of parts, lead time of the parts, cost of the parts, etc. The retrieved parts supply information is displayed in a manner allowing it to be distinguished from other items of parts supply information. The method of retrieval can be set as desired. The entirety of the parts supplies chains is displayed graphically, and the location where the problems exist becomes clear.