A method for determining a sharpness index of a pulse wave signal according to an embodiment comprises the steps of: receiving a pulse wave signal； determining a first reference line starting point and a second reference line starting point on the basis of a curvature of the pulse wave signal； determining a first reference line connecting the first reference line starting point and a first reference line ending point by determining the first reference line ending point by applying an intersecting tangent method to the first reference line starting point, and determining a second reference line connecting the second reference line starting point and a second reference line ending point by determining the second reference line ending point by applying the intersecting tangent method to the second reference line starting point； and determining a sharpness index by using a peak point of the pulse wave signal, the first reference line, and the second reference line.
