1. A method of estimating a frequency offset based on a training symbol in a receiver of an orthogonal frequency division multiplexing (OFDM) system, the method comprising: receiving a first training symbol having a periodicity and a predetermined second training symbol; calculating a correlation value for the first training symbol based on a coherence phase bandwidth (CPB); determining a position of a peak value from the correlation value for an integer multiple frequency offset candidate based on a threshold value; calculating a correlation value for the second training symbol based on the CPB; and estimating a position corresponding to a maximum value of the correlation value for the second training symbol as the frequency offset based on the position of the peak value.