Provided are an adaptive equalizer and adaptive equalization method thereof. The method includes obtaining an X-polarization error signal based on a first distance between a tap center and a barycenter of coefficients for mapping H and V onto X and a Y-polarization error signal based on a second distance between a tap center and a barycenter of coefficient for mapping H and V onto Y, performing an interpolation for the X-polarization data with the X-polarization error signal and an interpolation for the Y-polarization data with the Y-polarization error signal in a clock synchronization. Since X-polarization and Y-polarization are considered separately when errors are calculated, and are adjusted separately, an X-polarization coefficient and a Y-polarization coefficient are flexibly and effectively controlled to approach a tap center.