To appraise the price of a homepage on the Internet and to sell and buy the homepage on the Internet.

A web value appraisal automatic calculating program 7 is provided in a homepage 4 of a sponsor 1 of the Internet and the administrator 2 of a desired homepage 13 is made to enter a factor affecting the value of the homepage to a specific field, and the web value appraisal automatic calculating program automatically calculates the price of the homepage and the price is displayed 5b on the Internet. A procedure for formal evaluation application 9a is followed in the homepage of the sensor and an organization such as an evaluation committee 11 examines elements which are not considered during simple appraisal, adjusts the price calculated by the simple appraisal, and informs the administrator of the homepage of total appraisal 9. The price of the homepage is displayed on the Internet and the right to own the homepage is handled as a bond, so that the homepage can be sold and bought.