To provide related information adapted to contributed contents on a page where a contributed article is provided at a mode corresponding to the interest of a user.

A system is provided with a web sever device 1 managing the contributed article inputted from a client device 2 as contents and providing the contributed article contents in accordance with a request from the client device. A HOT exponent calculating function 14 calculates the degree of the activity of contribution and displays information (a), (b) and (c) related to the contributed articles A, B and C on the same page as the contributed article at the mode corresponding to the calculated degree of activity. Since it is considered that much more users refer to the pertinent page where much more users actively contributes messages, a related advertisement is displayed on the pertinent page at a mode where the size of the advertisement is enlarged, the advertisement is placed in a conspicuous position and display time is prolonged.