Provided is a method for displaying a graphical user interface on a server device and a client device for controlling the server device. The method may include receiving AV data being played in the server device at the client device, receiving a command at the client device to control the server device, generating a first graphical user interface in response to the received command for display on the client device together with the AV data received from the server device, transmitting a control signal corresponding to the command to the server device, and receiving information related to a second graphical user interface displayed on the server device in response to the command. The first graphical user interface may be displayed on the client device before the information related to the second graphical user interface displayed on the server device is received.