To provide a game house simulation system which produces dynamic models for a game house and environments and can verify performance of the game house, such as working conditions of the game machines.

A game house simulation system is provided with a parameter setting means 200 comprising a game house setting section 210 and an environment setting section 250, a simulation condition setting means 400 which produces simulation conditions using the module parameters set by the parameter setting means 200, a simulation object setting section 500 which sets a game house or its environments as the simulation object, a simulation implementation means 600 which implements prediction processing, and a displaying/outputting means 800 which outputs the predicted results. The game house setting section 210 is provided with a period/cashing rate parameter setting section responsible for cashing rate in a given period, and the simulation implementation means 600 is provided with a period/cashing rate simulation section which predicts business conditions of the game house in accordance with changed cashing rate in a given period.