To decrease the man-hour for gathering values of data and parameters without spoiling the reliability of a simulation result, by finding the setting and gathering sections of the data and parameters needed for simulation on the basis of a memory process plan, etc., and performing retention in a file and outputting onto a screen.

The system consists of the necessary data and parameter section display device S1 and a simulator S2. A process plan description means S11 of the necessary data and parameter section display device S1 describes a made process plan for physical distribution as a flow of activities. A memory S12 stores the described process plan. A data/parameter section means S13 finds the setting and gathering sections of the data and parameters needed for simulation on the basis of the described process plan. A data/parameter section output means S14 stored the setting and gathering sections of the data and parameters in an electronic file or outputs them on a document or screen.