To improve the reliability of a simulation result by simulating a phenomenon generated with the shift of an article by taking notice of space and time.

Course information LA and LB, start position information MA and MB, start time information NA and NB and travel speed information OA and OB are given for respective transportation means A and B. Information (Q1A, Q2A, Q1B and Q2B) showing in which stop time information among P1A, P2A, P1B and P2B and how long the transportation means stop are inputted. Thus, in which place the respective transportation means A and B are positioned and in what kind of state they are can be calculated whenever unit time elapses. They are calculated. At that time, whether a congestion matter is realized or not is discriminated and simulation considering congestion is executed. Data on the position, the state and congestion lapse time, which are calculated whenever unit time elapses, are graphic-displayed on a screen.