1. A graphics image generation method comprising controlling a computer to generate a graphics image for visualizing statistical data, comprising: a first group of steps including reading from a memory the statistical data to be processed, forming a plurality of strip regions in a region corresponding to said entire statistical data and arranging rectangles for representing individual data of said statistical data in said strip regions, and storing in the memory image data of the region corresponding to said entire statistical data with said rectangles arranged therein; and a second group of steps including reading from said memory the image data of the region corresponding to said entire statistical data, and with respect to sequences of the rectangles in said image data, rearranging the rectangles in each of said strip regions such that the rectangles corresponding to said individual data adjacent to each other in said statistical data are also adjacent to each other in the image, and storing the image data in the memory.