1. A game device which displays a game screen containing a moving instruction object image and a moving target candidate image, comprising: a moving destination candidate designation accepting unit configured to accept designation of a moving destination candidate position of the moving instruction object image; a determining unit configured to determine whether the moving destination candidate position and a position of the moving target candidate image satisfy predetermined conditions; and a display control unit that performs 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 unit, wherein a guide image is displayed at a position determined based on the position of the moving target candidate image in accordance with the result of the determination by the determining unit, wherein the guide image includes a message character string based on the parameter information corresponding to the moving target candidate image and the parameter information corresponding to the moving instruction object image.