Display apparatus having on-screen display control mechanism and on-screen display control method of the same

An on-screen display control method used in a display apparatus comprising:

• receiving a mouse input signal by a signal receiving terminal;
• receiving the mouse input signal from the signal receiving terminal through an input terminal by a switch circuit, transmitting the mouse input signal to a first output terminal under a mouse signal transmission mode and transmitting the mouse input signal to a second output terminal under an on-screen display control mode by the switch circuit;
• controlling the display panel to display an on-screen display frame having a plurality of control items, and receiving the mouse input signal from the second output terminal under the on-screen display control mode by a display control circuit;
• retrieving location information and key information from the mouse input signal by the display control circuit;
• controlling the display panel to display a mouse cursor over the on-screen display frame according to the location information by the display control circuit;
• selecting one of the control items corresponding to the mouse cursor as a selected control item according to the location information and the key information by the display control circuit;
• and
• executing a control function corresponding to the selected control item by the display control circuit.