A network receiver includes a first variable resistor, a second variable resistor, a first processing unit, a second processing unit and an adjusting circuit. The first variable resistor is coupled to a first transmission line via a first terminal for transmitting a first signal. The second variable resistor is coupled to a second transmission line via a second terminal for transmitting a second signal. The first processing unit is utilized for obtaining a difference according to the first signal and the second signal, and processing the difference to generate first data. The second processing unit is utilized for obtaining a summation according to the first signal and the second signal, and processing the summation to generate second data. The adjusting circuit is utilized for adjusting resistance(s) of at least one of the first variable resistor and the second variable resistor according to the first data and the second data.