A plurality of simulators operable to decentrally execute arithmetic operations based on a plurality of simulation models which are respectively assigned to the simulators under the control of a management device. A notifying section is operable to provide a notification so as to relate information regarding one of the simulation models displayed on a display of the management device to one of the simulators which executes an arithmetic operation based on the one of the simulation models. The management device and the simulators are connected with each other via a network.