To reduce an effect of a setting of a threshold (a window level) when displaying an image, provide an automatic processing method of a moving image in a diagnosis of a ventricular diastolic function, and provide a method precisely evaluating the ventricular diastolic function from a ventricular volume curve obtained from Cine MRI in the ventricular function evaluation by Cine MRI.

This method is so constituted that after Cine MRI is processed with a V (Variance dependent)-filter, the image processed with the V-filter is undergone with a differentiation and a thinning processing to form the boundary between the ventricular lumen blood and the endomyocardium and determine the volume of the ventricular lumen. This method is quantitatively evaluates a local myocardial wall movement and the ventricular function using the the ventricular lumen volume curve approximated by Fourier series and its differential curve.