Provided is an information influence evaluation method for carrying the processing of evaluating the degree of influence of notable transmitting information on an expression in influenced transmission information on the basis of the expression of the influenced transmission information as transmission information with reference to the notable transmission information. Furthermore, provided is an information influence evaluation system, which is provided with an influence degree evaluation means that carries the processing of evaluating the degree of influence of notable transmitting information on an expression in influenced transmission information on the basis of the expression of the influenced transmission information as transmission information with reference to the notable transmission information.
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