Patent ID: 8045058

Claim:
A method of determining port status in a television receiver including a plurality of signal input ports and including a main-screen signal processor for displaying a first image on a main screen of the television receiver and a sub-screen signal processor for displaying a second image on a sub-screen of the main screen, the method comprising: detecting a signal presence at at least one of the plurality of signal input ports via the sub-screen signal processor, to determine whether the corresponding input signal exists, by sequentially setting an input mode in correspondence to at least one of the plurality of signal input ports; recognizing as a valid signal input port where the signal presence is detected; and displaying OSD information indicative of the recognized valid signal input port for distinguishing between a valid signal input port and an invalid signal input port, wherein the displayed OSD information includes at least one valid signal input port and at least one invalid signal input port, and the valid signal input port is distinguished from the invalid signal input port by using a different marking or a highlight.