method and apparatus for data reception are provided , retrieving digital values transmitted through a cable . in a data receiver , an equalizer equalizes an input signal based on a boost value to generate an equalized signal , and a data extractor samples the equalized signal to extract output values from each symbol period . the data extractor detects signal quality of the equalized signal to adjust the boost value accordingly . an optimal time point is detected within one symbol period where an output value is an ensured valid , and variation rate of the optimal time point is counted as an inverse indicator of the signal quality .