The invention proposes an apparatus for reducing motion artifact in an ECG signal of a patient. The apparatus comprises a calculating unit configured to calculate a mean value beat from the ECG signal； a first obtaining unit configured to obtain a residual signal based on the ECG signal and the mean value beat calculated from the ECG signal； a filtering unit configured to perform filtering of the residual signal with one or more cut off frequencies； a second obtaining unit configured to obtain a modified ECG signal based on the filtered residual signal and the mean value beat； and a determining unit configured to determine the one or more cut off frequencies of the filtering based on an acceleration signal representative of motion status of the patient. By using the proposed apparatus, motion artifacts can be greatly removed from the ECG signal and the quality of the ECG signal can be therefore improved.
