A method of controlling an ultrasound diagnostic apparatus, the method comprising: transmitting (1710; 1810) a push pulse to a region of interest, ROI of a target object to induce a shear wave; adjusting a position of a focal point to which a plurality of tracking pulses (Tx1, Tx2, Tx3, Tx4) are transmitted, based on a position of the ROI; transmitting (1720; 1820) the plurality of tracking pulses to the ROI; setting sets (B1, B2, B3, B4) of multi-reception scan lines (Rx1-1 to Rx4-4), each set corresponding to a respective one of the plurality of tracking pulses; receiving (1730; 1830) ultrasound echo signals reflected from the ROI in response to the plurality of tracking pulses, along the multi-reception scan lines; estimating (1780; 1870) a velocity of the shear wave associated with the ROI based on the ultrasound echo signals received along the multi-reception scan lines; generating a shear wave elasticity image based on the velocity of the shear wave; and outputting the shear wave elasticity image on a display; characterized in that the estimating (1780; 1870) of the velocity of the shear wave includes at least one of: grouping reception scan lines positioned at a same relative position in each of the sets of the multi-reception scan lines to generate a plurality of groups, estimating a plurality of velocities of the shear wave each corresponding to a respective one of the plurality of groups, and determining a final velocity of the shear wave based on the plurality of the velocities of the shear wave; and selecting on the basis of a predetermined selection type some reception scan lines from the multi-reception scan lines and estimating the velocity of the shear wave based on ultrasound echo signals received along the selected some reception scan lines. transmitting (1710; 1810) a push pulse to a region of interest, ROI of a target object to induce a shear wave; adjusting a position of a focal point to which a plurality of tracking pulses (Tx1, Tx2, Tx3, Tx4) are transmitted, based on a position of the ROI; transmitting (1720; 1820) the plurality of tracking pulses to the ROI; setting sets (B1, B2, B3, B4) of multi-reception scan lines (Rx1-1 to Rx4-4), each set corresponding to a respective one of the plurality of tracking pulses; receiving (1730; 1830) ultrasound echo signals reflected from the ROI in response to the plurality of tracking pulses, along the multi-reception scan lines; estimating (1780; 1870) a velocity of the shear wave associated with the ROI based on the ultrasound echo signals received along the multi-reception scan lines; generating a shear wave elasticity image based on the velocity of the shear wave; and outputting the shear wave elasticity image on a display; characterized in that the estimating (1780; 1870) of the velocity of the shear wave includes at least one of: grouping reception scan lines positioned at a same relative position in each of the sets of the multi-reception scan lines to generate a plurality of groups, estimating a plurality of velocities of the shear wave each corresponding to a respective one of the plurality of groups, and determining a final velocity of the shear wave based on the plurality of the velocities of the shear wave; and selecting on the basis of a predetermined selection type some reception scan lines from the multi-reception scan lines and estimating the velocity of the shear wave based on ultrasound echo signals received along the selected some reception scan lines. grouping reception scan lines positioned at a same relative position in each of the sets of the multi-reception scan lines to generate a plurality of groups, estimating a plurality of velocities of the shear wave each corresponding to a respective one of the plurality of groups, and determining a final velocity of the shear wave based on the plurality of the velocities of the shear wave; and selecting on the basis of a predetermined selection type some reception scan lines from the multi-reception scan lines and estimating the velocity of the shear wave based on ultrasound echo signals received along the selected some reception scan lines.