To provide an image displaying apparatus capable of displaying the blood stream kinetics information and the form of the blood vessel.

The apparatus includes a blood stream kinetics analyzing means 110 for obtaining time series volume data and analyzing blood stream kinetics three-dimensionally to obtain a 3D functional image, a blood vessel information analyzing means 120 capable of obtaining various blood parameters such as a blood vessel shape, peak time or contrast medium reach time per Voxel, and a rendering means 130 capable of superimposed display of distribution of the functional image on the 3D space and 3D scan of blood vessel obtained above, and a displaying means 140 for display the rendering results.