Knowledge held by persons is accumulated by using a computer, and any person visually searches for the knowledge and utilizes a result of the search to continuously accumulate new knowledge, so that accurate, efficient work is implemented. Various types of knowledge are accumulated by describing knowledge held by persons in a coordinate system of 2D data or 3D data produced by digital techniques by using a method of a feature point representing a location of the knowledge by using a geometric shape or a position of a coordinate of the coordinate system.
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