Abstract: A system extracts a member who matches with search option given by a target member who searches the other members. The target member is informed of URL indicating an open profile web page of the extracted member. The target member refers to the open profile of the introduced member, and sends a message to the introduced member. The target member is charged for the message transmission if the target member sends the message to the introduced member concerned first time. The introduction member refers to the message posted to his/her bulletin board, and refers to an open profile of the message sender. If the introduced member decides to send a reply to the target member after referring to the message and the open profile, the introduced member post a message to a bulletin board of the target member. The introduced member is not charged for the reply transmission.