The present invention causes a computer to function as a virtual space generating unit, a game screen displaying unit and a fluid displaying unit.A fluid displaying unit displays pseudo three-dimensional representation of fluid in virtual space on a game screen. And the fluid displaying includes a model setting unit, a polygon mesh setting unit and a fluid setting unit. The model setting unit sets a predetermined linear model on the virtual space and moves a basis portion of the linear model to a predetermined direction, and moves the linear model to follow virtual points which are shot from the basis portion at intervals and which move to follow a predetermined track including the basis portion as a starting point.