An ultrasound diagnosis apparatus of the present invention has: an image generator configured to execute transmission/reception of ultrasound waves to chronologically generate ultrasound image data of plural frames a multiresolution decomposition part configured to hierarchically perform multiresolution decomposition on the ultrasound image data to acquire first-order to nth-order (n represents a natural number of 2 or more) low-band decomposition image data and first-order to nth-order high-band decomposition image data a feature amount calculator configured to calculate a feature amount based on the acquired low-band decomposition image data a filtering processor configured to perform a filtering operation on the calculated feature amount and a multiresolution composition part configured to execute multiresolution composition using the low-band decomposition image data and high-band decomposition image data to generate a composite image. Thus, the apparatus can efficiently reduce change in speckle/noise in the temporal direction and perform a process without a time phase delay.
