1. A game device which displays a game screen containing a moving instruction object image and a moving target candidate image, comprising: moving destination candidate designation accepting means for accepting designation of a moving destination candidate position of the moving instruction object image; determining means for determining whether or not the moving destination candidate position and a position of the moving target candidate image satisfy predetermined conditions; and display control means for performing a display output associated with the moving target candidate image on the basis of parameter information corresponding to the moving target candidate image and parameter information corresponding to the moving instruction object image, according to a result of the determination made by the determining means.