A system and a method for controlling a multipoint conference are provided by the present invention. The system comprises a plurality of computers, a presentation gateway, and a projector, wherein the computers are stored presentation frames. The method comprises the steps of connecting a first computer to the presentation gateway via a network; downloading a user list on the network from the presentation gateway; submitting a presentation-request signal to a second computer of the user list; and the first computer having a granted authority to access the presentation frames of the second computer while under the condition of the second computer granting the presentation-request signal, and the first computer transmitting the presentation frames of the second computer to the projector through the presentation gateway.