Abstract: A technique for permitting collaboration and coordination between the content displayed in multiple web browsers, such as the browser for a customer and the browser for a company agent. An HTTP request is sent from a customer browser to a web server via a collaboration server. The web server then sends an HTTP message responding to this request to the customer web browser via the collaboration server. At this time, the collaboration server refers to stored information, such as past history information and customer purchasing records. When the HTTP message includes data which corresponds to a predetermined condition relative to the stored information, the collaboration server embeds a program for displaying predetermined information in the HTTP message. The modified HTTP message is then sent to one of a customer browser or the browser of a collaborating agent collaborating with the customer or both, and the embedded program is executed and predetermined information is displayed.