To analyze customers' demands for products, specify the customers who potentially need the technical information on the products and transmit the technical information.

A data base 119 on the tend of the demand for customer products records whether the products were bought, whether negotiations were made, whether questions were made and so on for every product and for every customer. A technical know-how transmitting part 107 acknowledges the relationship (whether the purchase was made and the negotiations were made) between the questioners of specific question-and-answer examples accumulated in a question-and-answer example data base 111 and the products, to which the question-and- answer examples are subjected, based on the content of the data base 119 on the trend of the demand for the customer products, acknowledges the relationship (whether the purchase was made and the negotiations were made) between the subject products and every customer, compares the relationship acknowledged for every other customer with the relationship acknowledged by the questioners, sets up evaluation values for prescribed evaluation items (whether the questions were made and so on) based on the result of the comparison, and transmits the specific question-and-answer examples to the terminals 101 of the customers whose total evaluation value is over a prescribed threshold level.