Abstract: With the object of properly classifying a flat-shaped red blood cell in the blood of a human being to thereby determine the constitution of the human being, an outer diameter of a ring-shaped figure corresponding to a diameter d of the red blood cell, and a width of the ring-shaped figure corresponding to a thickness t of a cell membrane of the red blood cell are extracted as the features of the red blood cell, on the basis of red-blood-cell image data produced for allowing a portion of a cross section of the red blood cell to be obtained by cutting the red blood cell in a direction of the plane of the red blood cell, to be visualized as the ring-shaped figure, wherein the portion corresponds to the cell membrane, and the red blood cell is classified as one of a predetermined plurality of types of red blood cells including an expansion, a contraction, and a medium type, on the basis of the extracted features.

Abstract: This invention relates to a technology for determining the constitution of a human being by the use of a computer. For the purpose of a precise determination of the constitution, this invention is constructed such that the constitution is determined as one of a predetermined plurality of types, on the basis of a distribution pattern reflecting how a population consisting of tendencies of the human being to show with respect to respective items has been scattered over a range of ranks (ranging from a yin-rank to a yang-rank through a medium-rank) indicative of strengths of the tendencies. The plurality of types consist of basic or independent types A, B, C, D, and E, and compound types AB, AD, BC, CD, and E+.