To provide a game program and a game device which uses sunlight as a parameter for the progress of a game but does not require for the mounting of a sensor or the like to a game machine.

The game device makes a computer 10 to which two displays 3A and 3B are connected follow a procedure for advancing a game based on the development of a prescribed scenario on the screen of one display 3B of the two displays, a procedure for computing and determining a weather at the time when a player is playing a game and storing in a memory as weather data, a procedure for reading weather image data DAT corresponding to the weather data from the memory and generating a weather image PC1 to be displayed on a display on the basis of the weather data stored in the memory and a procedure for displaying the generated weather image in the other display 3B of the two displays independently from the development of the scenario based on a procedure for advancing the scenario.