An ultrasound apparatus comprising: a data obtaining unit configured to obtain ultrasound data of an object; a controller configured to generate an ultrasound image based on the ultrasound data, obtain blood flow information of the object by using a Doppler component obtained from the ultrasound data, and set a plurality of sample volume gates (711, 721, 731) based on the blood flow information, wherein the object is a blood vessel a display configured to display the ultrasound image in which the plurality of sample volume gates (711, 721, 731) are displayed; wherein the ultrasound apparatus is configured to display a plurality of scan lines (710, 720, 730) respectively corresponding to the plurality of sample volume gates (711, 721, 731) on the ultrasound image; a user interface configured to receive a user input for setting at least one sample volume gate from among the plurality of sample volume gates (711, 721, 731) at a predetermined location of the object displayed in the ultrasound image, wherein the location of a sample volume gate is adjustable by a user moving a scan line; wherein: the controller is configured to set the at least one sample volume gate based on the user input, the blood flow information comprises at least one of a blood flow velocity, a blood flow amount, a blood flow pressure, and a blood flow angle characterised in that the controller is further configured to set a point having a maximum magnitude of a blood flow velocity on the blood vessel to a first sample volume gate, the controller is further configured to set two points on the blood vessel where a blood flow velocity is less than a predetermined criterion value to a second sample volume gate and a third sample volume gate, wherein the first sample volume gate is positioned between the second sample volume gate and the third sample volume gate on the blood vessel. a data obtaining unit configured to obtain ultrasound data of an object; a controller configured to generate an ultrasound image based on the ultrasound data, obtain blood flow information of the object by using a Doppler component obtained from the ultrasound data, and set a plurality of sample volume gates (711, 721, 731) based on the blood flow information, wherein the object is a blood vessel a display configured to display the ultrasound image in which the plurality of sample volume gates (711, 721, 731) are displayed; wherein the ultrasound apparatus is configured to display a plurality of scan lines (710, 720, 730) respectively corresponding to the plurality of sample volume gates (711, 721, 731) on the ultrasound image; a user interface configured to receive a user input for setting at least one sample volume gate from among the plurality of sample volume gates (711, 721, 731) at a predetermined location of the object displayed in the ultrasound image, wherein the location of a sample volume gate is adjustable by a user moving a scan line; wherein: the controller is configured to set the at least one sample volume gate based on the user input, the blood flow information comprises at least one of a blood flow velocity, a blood flow amount, a blood flow pressure, and a blood flow angle characterised in that the controller is further configured to set a point having a maximum magnitude of a blood flow velocity on the blood vessel to a first sample volume gate, the controller is further configured to set two points on the blood vessel where a blood flow velocity is less than a predetermined criterion value to a second sample volume gate and a third sample volume gate, wherein the first sample volume gate is positioned between the second sample volume gate and the third sample volume gate on the blood vessel. the controller is configured to set the at least one sample volume gate based on the user input, the blood flow information comprises at least one of a blood flow velocity, a blood flow amount, a blood flow pressure, and a blood flow angle characterised in that the controller is further configured to set a point having a maximum magnitude of a blood flow velocity on the blood vessel to a first sample volume gate, the controller is further configured to set two points on the blood vessel where a blood flow velocity is less than a predetermined criterion value to a second sample volume gate and a third sample volume gate, wherein the first sample volume gate is positioned between the second sample volume gate and the third sample volume gate on the blood vessel.