PURPOSE: To simultaneously execute the simulation of plural models and to observe and compare the detailed operation of plural models in their execution processes.

CONSTITUTION: This simulation system is provided with a simulation executing means 111 for receiving inputs from plural model function describing files 103, 105 and a simulation process control means 101 for controlling the display of simulation processes of plural models, simultaneously executing the simulation of plural models and generating simulation analysis data, a simulation result processing means 115 for generating a simulation execution result from the simulation analysis data of plural models and a simulation model display means 113 for displaying the simulation processes of plural models.