To make displayable a next screen different from the screen of its own terminal at the other terminal in a system using a WWW technique.

A screen linking means 4 is provided with next screen display requests corresponding to its own terminal and the other terminal. When a next screen instruction is issued on the arbitrary screen of a browser 1, the screen linking means 4 transmits the next screen display request corresponding to the other terminal to a screen controlling part 5. The screen controlling part 5 communicates this next screen display request to a communication controlling part 6, and the communication controlling part 6 transmits it to the destination of the other terminal. In the other terminal, the communication controlling part 6 receives this next screen display request, and transfers it to the screen controlling part 5. Then, the screen controlling part 5 informs the screen linking means 4 of this next screen display request, and the screen linking means 4 instructs the browser 1 to display the requested screen. The browser 1 requests the pertinent screen to a WWW server 300.