A display device for indicating connection statuses of a communication channel between two systems is disclosed, the communication channel having a plurality of communication links. The display device comprises a detecting circuit coupled to the communication channel for detecting a plurality of link statuses of the communication links; an indicator controller coupled to the detecting circuit for determining the connection statuses of the communication channel according to the link statuses; and an LED indicator coupled to the indicator controller for displaying in a plurality of statuses according to the connection statuses from the indicator controller; wherein the connection statuses comprise a first connection status indicating that all the link statuses are “ON”, a second connection status indicating that all the link statuses are “OFF”, and a third connection status indicating that at least one of the link statuses is “ON” and at least one of the link statuses is “OFF”.