A method of estimating an orthogonal frequency division multiplexing (OFDM) integer frequency offset is disclosed. The method includes generating N combined sub-carrier components by superposing G received sub-carrier components of N received sub-carrier components constituting received symbol, outputting a primary estimated integer frequency offset value from a candidate value, which makes primary correlated values, obtained with respect to primary integer frequency offset candidate values, to be largest, and outputting a secondary estimated integer frequency offset value from a secondary candidate value, which makes secondary correlated values, obtained with respect to secondary integer frequency offset candidate values based on primary estimated integer frequency offset value, to be largest.