1. A keyword display system, comprising: a speaker specifier that specifies a speaker; a weight determinator that determines a weight of the specified speaker; a keyword extractor that extracts keywords from a speech of said speaker; a keyword relation degree calculator that calculates a relation degree between said extracted keywords, carries out a weighting for this calculated relation degree by using the weight of the speaker having spoken said keywords, and calculates a keyword relation degree between the keywords; and a keyword display controller that displays a relevancy between said extracted keywords responding to said keyword relation degree.