抄録
In decision making problem, it is natural to decide the problem including person's nature besides basic method such as AHP (Analytic Hierarchy Process ). The person's nature is expressed by a vector defined on n - dimensional space. The vector is classified into several categories related with the selection of the best alternative. The categories are mapped onto two - dimensional plane by a pair of the vectors defined on n - dimensional space. Thus we can visually analyze the character of categories, i.e. the person's nature, by the computer simulation.