Image display system and image presenting method thereof

An image display system, comprising a display apparatus and an image presenting apparatus, wherein the display apparatus is configured to receive an output image signal and generate an image frame, and the image display apparatus comprises:

• a signal receiving module, obtaining a plurality of input image signals from a plurality of image sources outside the image presenting apparatus;
• an image processing module, coupled to the signal receiving module, receiving the input image signals, and generating the output image signal according to at least one of the input image signals, wherein the image processing module is coupled to the display apparatus to provide the output image signal;
• and
• a control unit, coupled to and controlling the image processing module,
• wherein the control unit receives a preview request, so as to simultaneously and timely present the input image signals of all the image sources in a preview block of the image frame by using the image processing module, and the control unit further receives a select request, so as to generate the output image signal according to at least one of the input image signals that is selected,
• wherein the image display system further comprises an input apparatus and the image presenting apparatus comprises a decoder, wherein the input apparatus generates an input signal and transmits the input signal to the decoder to decode the input signal and generate a decoded input signal, and the control unit receives the decoded input signal to determine whether the preview request or the select request is received.