1. A myocardial motion analysis apparatus for analyzing a motion of a myocardium of a left ventricle in a medical image slice time series, the medical image slice time series comprising a plurality of image slices acquired with respect to a section of the left ventricle intersected with a long axis of the left ventricle at a plurality of time points in a cardiac cycle, the apparatus comprising: a contour acquisition section configured to acquire an endocardial contour and an epicardial contour of the left ventricle in each image slice; a point linking pair configuration section configured to configure contour points on the endocardial contour and the epicardial contour in a reference image slice of the image slice time series as a plurality of point linking pairs, each point linking pair comprising a contour point on the endocardial contour and a contour point on the epicardial contour, and the two contour points of each point linking pair being located on the same normal of a reference contour of a left ventricle wall in the reference image slice; a point linking pair tracking section configured to determine locations of each point linking pair in other image slices of the image slice time series; and a motion vector calculation section configured to calculate, according to the locations of the plurality of point linking pairs in adjacent image slices of the image slice time series, a motion vector of the myocardium of the left ventricle between the adjacent image slices, the myocardium being defined by the endocardial contour and the epicardial contour.