A computer-method of extracting a feature of a biosignal, the method comprising: sensing a waveform of a blood pulse wave; determining an acceleration waveform from the sensed waveform of the blood pulse wave by performing a second order differential on the sensed waveform; searching for a point (T 0) at which the acceleration waveform is maximized in a vicinity of a start point of the acceleration waveform; and searching for a position of a positive peak point (T 1) positioned subsequent to the maximum point (T 0) of the acceleration waveform, wherein the start point corresponds to a position of the acceleration waveform at which a heart contraction starts; characterized in that the method further comprises the steps of: extracting an incident acceleration waveform by extracting an interval from the acceleration waveform from the maximum point (T 0) of the acceleration waveform to the subsequent positive peak point (T 1); obtaining a cross-correlation function between the determined acceleration waveform and the extracted incident acceleration waveform over time by moving the incident acceleration waveform during an interval of the acceleration waveform from the start point (T 0) to an end point (T 2) subsequently located to said peak point (T 1); extracting a feature of the biosignal based on the cross-correlation between the acceleration waveform and the incident acceleration waveform by extracting the feature of the blood pulse wave based on at least one of a number of peak points comprised in the cross-correlation, positions of the peak points comprised in the cross-correlation, or values of the peak points comprised in the cross-correlation. sensing a waveform of a blood pulse wave; determining an acceleration waveform from the sensed waveform of the blood pulse wave by performing a second order differential on the sensed waveform; searching for a point (T 0) at which the acceleration waveform is maximized in a vicinity of a start point of the acceleration waveform; and searching for a position of a positive peak point (T 1) positioned subsequent to the maximum point (T 0) of the acceleration waveform, wherein the start point corresponds to a position of the acceleration waveform at which a heart contraction starts; characterized in that the method further comprises the steps of: extracting an incident acceleration waveform by extracting an interval from the acceleration waveform from the maximum point (T 0) of the acceleration waveform to the subsequent positive peak point (T 1); obtaining a cross-correlation function between the determined acceleration waveform and the extracted incident acceleration waveform over time by moving the incident acceleration waveform during an interval of the acceleration waveform from the start point (T 0) to an end point (T 2) subsequently located to said peak point (T 1); extracting a feature of the biosignal based on the cross-correlation between the acceleration waveform and the incident acceleration waveform by extracting the feature of the blood pulse wave based on at least one of a number of peak points comprised in the cross-correlation, positions of the peak points comprised in the cross-correlation, or values of the peak points comprised in the cross-correlation. extracting an incident acceleration waveform by extracting an interval from the acceleration waveform from the maximum point (T 0) of the acceleration waveform to the subsequent positive peak point (T 1); obtaining a cross-correlation function between the determined acceleration waveform and the extracted incident acceleration waveform over time by moving the incident acceleration waveform during an interval of the acceleration waveform from the start point (T 0) to an end point (T 2) subsequently located to said peak point (T 1); extracting a feature of the biosignal based on the cross-correlation between the acceleration waveform and the incident acceleration waveform by extracting the feature of the blood pulse wave based on at least one of a number of peak points comprised in the cross-correlation, positions of the peak points comprised in the cross-correlation, or values of the peak points comprised in the cross-correlation.