The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The disclosure is A first apparatus for estimating a delay time in a synchronization system is provided. The first apparatus includes a detector configured to detect a request signal generated by a second apparatus, and a generator configured to generate a response signal corresponding to the request signal and output the response signal. The request signal is received through a cable from the second apparatus and the response signal is transmitted to the second apparatus through the cable.