A demodulation method using phase detection and an apparatus thereof are provided. The demodulation method includes detecting phase information by sampling a received signal, synchronizing at least one clock signal by using the detected phase information, oversampling the received signal by the synchronized clock signal, and demodulating the received signal by using the oversampled result. With this, the demodulating apparatus can demodulate the modulated signal by using the phase detection, and use a digital filter as a filter for removing a jitter from the demodulated signal, thereby allowing a size thereof to be minimized.