Disclosed is a method and system for allowing a server system to control a video structure of a client system through a video of an optimized size and to transmit the controlled video structure in a system in which video conference is remotely available. The method includes a step of allowing a control unit of any one client system to request a main control unit of a server system to change the video structure which includes coordinates and video size; and allowing the main control unit to make a change so as to coincide with the request of the control unit of the client system, which has requested the change of the video structure being currently outputted to a video conference monitor, and to transmit the change to a control unit of each client system.