Abstract: A space in which a character is movable is divided into a plurality of sections. Of those sections, some sections are of a first type which are set with a specific event such as a fight with a boss character, while other sections are of a second type. Randomly extracted maps are employed in association with the sections of the second type. In the case of the sections of the first type, the corresponding fixed maps particular thereto are loaded from a storage medium into a memory. In the case of the sections of the second type, map data extracted randomly from the corresponding plural map data are loaded from the storage medium into the memory. A map defining a movable area for the character is generated in accordance with the loaded map data.