A lip synchronization test method for Digital TV receivers, the method comprising the steps of: generating digital audio (701, 901) and video (702, 902) signals each having a time index inserted therein including a number of sinusoidal waves; comparing the waveform of the time index inserted audio signal with that of the time index inserted video signal (TATS);: calculating an nth audio frame time ta from the time index inserted audio frame waveform and calculating an mth video field time tv from the time index inserted video frame waveform based upon a table representing a relationship between the time index of the audio signal and the time index of the video signal, wherein the table includes a correspondence relationship between a number of index signal, the time index of the audio frame waveform, an audio frame number, the time index of the video frame waveform (TATS) and a video frame number, wherein the time index of the audio frame waveform is calculated by detecting a time period from an initial position of the audio frame until a sinusoidal wave appears, the number of the index signal is calculated by counting the number of the appeared sinusoidal waves after detecting the time period, the audio frame number is calculated by using the time index of the audio signal and the number of index signal, the nth audio frame time ta is calculated by multiplying the audio frame number by a time of one audio frame, and wherein the mth video field time tv is calculated by using the time index of the video frame waveform and the video frame number; and calculating a lip synchronization time difference dt between the audio and video signals based on the audio frame time ta and the video field time tv. generating digital audio (701, 901) and video (702, 902) signals each having a time index inserted therein including a number of sinusoidal waves; comparing the waveform of the time index inserted audio signal with that of the time index inserted video signal (TATS);: calculating an nth audio frame time ta from the time index inserted audio frame waveform and calculating an mth video field time tv from the time index inserted video frame waveform based upon a table representing a relationship between the time index of the audio signal and the time index of the video signal, wherein the table includes a correspondence relationship between a number of index signal, the time index of the audio frame waveform, an audio frame number, the time index of the video frame waveform (TATS) and a video frame number, wherein the time index of the audio frame waveform is calculated by detecting a time period from an initial position of the audio frame until a sinusoidal wave appears, the number of the index signal is calculated by counting the number of the appeared sinusoidal waves after detecting the time period, the audio frame number is calculated by using the time index of the audio signal and the number of index signal, the nth audio frame time ta is calculated by multiplying the audio frame number by a time of one audio frame, and wherein the mth video field time tv is calculated by using the time index of the video frame waveform and the video frame number; and calculating a lip synchronization time difference dt between the audio and video signals based on the audio frame time ta and the video field time tv. calculating an nth audio frame time ta from the time index inserted audio frame waveform and calculating an mth video field time tv from the time index inserted video frame waveform based upon a table representing a relationship between the time index of the audio signal and the time index of the video signal, wherein the table includes a correspondence relationship between a number of index signal, the time index of the audio frame waveform, an audio frame number, the time index of the video frame waveform (TATS) and a video frame number, wherein the time index of the audio frame waveform is calculated by detecting a time period from an initial position of the audio frame until a sinusoidal wave appears, the number of the index signal is calculated by counting the number of the appeared sinusoidal waves after detecting the time period, the audio frame number is calculated by using the time index of the audio signal and the number of index signal, the nth audio frame time ta is calculated by multiplying the audio frame number by a time of one audio frame, and wherein the mth video field time tv is calculated by using the time index of the video frame waveform and the video frame number; and calculating a lip synchronization time difference dt between the audio and video signals based on the audio frame time ta and the video field time tv.