A determination system comprising: a determination device configured to perform determination processing of determining whether a coordinate to be determined exists inside or outside a polygon for inside/outside determination; and a first preprocessing device configured to perform preprocessing of the determination processing, the first preprocessing device including: a division unit configured to acquire coordinate information of respective vertexes of the polygon for inside/outside determination and divide the polygon for inside/outside determination into a plurality of polygons as preprocessing, and a first output unit configured to output coordinate information of respective vertexes of the respective divided polygons for inside/outside determination as divided polygon information, the determination device determining whether the coordinate to be determined exists inside or outside the polygon for inside/outside determination using information after the preprocessing, characterized in that the determination device is further being configured to use the divided polygon information to set a plurality of Minimal Bounding Rectangles, MBRs, including the divided polygons for inside/outside determination, and use the set plurality of MBRs to perform the determination processing. a determination device configured to perform determination processing of determining whether a coordinate to be determined exists inside or outside a polygon for inside/outside determination; and a first preprocessing device configured to perform preprocessing of the determination processing, the first preprocessing device including: a division unit configured to acquire coordinate information of respective vertexes of the polygon for inside/outside determination and divide the polygon for inside/outside determination into a plurality of polygons as preprocessing, and a first output unit configured to output coordinate information of respective vertexes of the respective divided polygons for inside/outside determination as divided polygon information, the determination device determining whether the coordinate to be determined exists inside or outside the polygon for inside/outside determination using information after the preprocessing, characterized in that the determination device is further being configured to use the divided polygon information to set a plurality of Minimal Bounding Rectangles, MBRs, including the divided polygons for inside/outside determination, and use the set plurality of MBRs to perform the determination processing. a division unit configured to acquire coordinate information of respective vertexes of the polygon for inside/outside determination and divide the polygon for inside/outside determination into a plurality of polygons as preprocessing, and a first output unit configured to output coordinate information of respective vertexes of the respective divided polygons for inside/outside determination as divided polygon information, the determination device determining whether the coordinate to be determined exists inside or outside the polygon for inside/outside determination using information after the preprocessing, characterized in that the determination device is further being configured to use the divided polygon information to set a plurality of Minimal Bounding Rectangles, MBRs, including the divided polygons for inside/outside determination, and use the set plurality of MBRs to perform the determination processing.