Abstract: Disclosed herein are a media signal sink (100) having a graphic user interface (GUI) function and a method for displaying devices connected thereto. In a method for operating a media signal sink (100) connected with one or more signal sources (200,202,204,206,208) each having one or more devices, the display method includes checking connection states of the signal sources (200,202,204,206,208) to the signal sink (100), and displaying menu items of the devices of the signal sources (200,202,204,206,208) connected to the signal sink (100) in a GUI screen, based on a result of the connection state check. In the GUI screen, menu items of the same type of devices, among the devices of the signal sources (200,202,204,206,208), are displayed under the condition that they are grouped into one group. Also, in the GUI screen, menu items of devices corresponding to the same type of signal sources are displayed under the condition that they are grouped into one group.