An embodiment of the present invention discloses a method for quickly responding to a signal, where the method includes: generating a frame synchronization signal; pre-reading image data, and saving the image data after processing the image data; and receiving a TE signal, and outputting the processed image data according to the TE signal. An embodiment of the present invention further discloses an apparatus for quickly responding to a signal. Using the present invention may improve a rate for responding to a signal and reduce an instantaneous bandwidth pressure on a transmission line.