A tomographic image forming unit forms a tomographic image of a target tissue on the basis of received signals which are obtained by sending and receiving ultrasound waves to and from the target tissue. A tomographic image analysis unit analyzes a formed tomographic image with image processing techniques and extracts a reference portion on the target tissue. On the basis of the extracted reference portion, a Doppler measurement position specification unit specifies a Doppler measurement position. A Doppler waveform forming unit performs Doppler measurement at the specified Doppler measurement position and forms a Doppler waveform. The formed tomographic image, a cursor which indicates the specified Doppler measurement position, and the formed Doppler waveform are displayed on a display unit. When specifying the Doppler measurement position, a color Doppler image may also be referred to.
