A OFDM system, a symbol estimation apparatus and an inter-carrier interference cancellation method for estimating a symbol value using the output of a forward error correction decoder. The OFDM system includes a symbol estimation unit, a time varying channel impulse response estimation unit and an interference cancellation unit. The symbol estimation unit performs forward error correction on a received OFDM signal according to a forward error correction code to estimate a symbol value of the received OFDM signal. The time varying channel impulse response estimation unit estimates a time varying channel impulse response in response to the received OFDM signal. The interference cancellation unit cancels inter-carrier interference between carriers of the received OFDM signal based on the estimated symbol value output from the symbol estimation unit and the estimated time varying channel impulse response output from the time varying channel impulse response estimation unit.