NON-TRANSITORY STORAGE MEDIUM HAVING STORED THEREIN INFORMATION PROCESSING PROGRAM, INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING SYSTEM

An information processing program for generating virtual terrain causes a computer to function as: a terrain object allocating unit 42, which allocates a terrain object automatically selected from a plurality of terrain object candidates as a selected terrain object to each of a plurality of areas segmented in a planar direction in a three-dimensional virtual space; a height parameter determining unit 43 that automatically determines a height parameter indicating a position in the height direction in the three-dimensional virtual space for each of the plurality of selected terrain objects; and a terrain generation unit 45 that generates virtual terrain that includes the selected terrain objects placed at locations corresponding to the allocated areas and based on height parameters.