1. A registration apparatus characterized by comprising: dividing means for dividing a blood vessel line included in an image into a plurality of partial lines on the basis of end points and a diverging point of the blood vessel line; extracting means for extracting coefficients of terms corresponding to degrees included in a polynomial equation for an n-th order curve representing each of the plurality of partial lines; and generating means for generating data including points at both ends of each of the plurality of partial lines and the coefficients.