2. A concept network display system according to claim 1, said first means including means for changing the concepts displayed in the concept tree window to another hierarchical tree arrangement including said new current concept.
1. A concept network display system for representing knowledge-based information in a combination of concept nodes and relation links, comprising: input means for inputting data to indicate a current concept; knowledge base storage means for holding said knowledge-based information; display means for displaying concepts stored in said knowledge base storage means; first means for controlling said display means to display a concept tree window for showing concepts in a hierarchical tree arrangement including a current concept indicated by said input means; second means for controlling said display means to display a superconcept window for showing a superconcept of said current concept; third means for controlling said display means to display a subnetwork window for showing at least one concept combined with said current concept in any of instance relation and generic relation; select means responding to an input of data via said input means for selecting a concept of said concepts displayed on one of said windows by said display means to designate the selected concept as a new current concept; and rewrite means responsive to said new current concept for rewriting said concept tree window, said superconcept window and said subnetwork window based on said new current concept.