An object of the present invention is to provide a reliable supplier evaluation system for correctly evaluating suppliers. A supplier evaluation system 117 according to the present invention is a system for evaluating suppliers based on information relating to a transaction conducted between a buyer and the supplier. The supplier evaluation system 117 is provided with a reception function for receiving communication information 134 and e-commerce information conducted between a buyer and a supplier and that exists in a company system such as that of a buyer, a conversion function for converting the communication information and the e-commerce information into a predetermined format, a database 133 for storing keyword information, and an analysis function 127 for comparing keyword information 138 registered in advance in a storage device with the converted communication information and e-commerce information, and determining a cause of a transaction result of the e-commerce information.