Multiple object information, in which first kind of object information indicating information on a first kind of object is associated with second kind of object information indicating information on a second kind of object, is stored in a multiple object information memory. The second kind of object is an object protected against a damage by means of the first kind of object. Multiple objects constructed by the first and second kinds of objects are displayed on a game screen on the basis of the multiple object information stored in the multiple object information memory. A damage cause indicating a cause of the damage that the displayed multiple objects receives is specified. At least the damage, which the second kind of object receives, is specified on the basis of the specified damage cause and a state of the first kind of object in the video game.