A switch device applicable to a server has at least a display chip set, a switch unit, a logic unit, a first connector and a second connector. The display chip set is used to provide a plurality of video signals. The switch unit and the logic unit are connected to the display chip set to receive at least one of the video signals and switch an output path of the received video signal. The first connector and the second connector are connected to the switch unit and the logic unit for selectively connecting to a display, thereby allowing a server to operate with double display connectors. The two connectors are positioned at different sides of the server, which makes it convenient for the management and maintenance of the server.