The present invention can assist realization of a
front loading design in consideration of an environmental
impact index. The present invention comprises: a
processing category reception unit that receives
processing categories for design targets on a design screen; a bill-of-process (BOP) candidate calculation unit that specifies, for each of the
processing categories, a candidate for a processing method which belongs to the processing category, and calculates, as a BOP candidate, a combination of candidates for the processing method which have been specified for all of the design targets; an environmental
impact index calculation unit that calculates the environmental
impact index of the BOP candidate; and a display information generation unit that displays, on the design screen, the environmental
impact index in association with the BOP candidate.