An ultrasound diagnosis apparatus for providing risk information of plaque using surface shape and brightness information, the ultrasound diagnosis apparatus comprising: a data acquirer configured to obtain ultrasound data about an object having blood vessels; an image processor configured to extract a blood vessel area from an ultrasound image generated based on the ultrasound data, extract a plaque area (510, 520, 530) included in the blood vessel area, and analyze a risk of plaque based on a surface shape of the plaque area (510, 520, 530) and brightness information of the plaque area (510, 520, 530); and a display; characterized in that: the display is configured to display the risk of plaque; and the brightness information of the plaque area comprises a brightness level of the plaque area and a distribution state of brightness values in the plaque area, and the image processor is configured to determine the risk of plaque to be high when the brightness level of the plaque area is equal to or greater than a first critical value or less than a second critical value that is less than the first critical value and to determine the risk of plaque to be low when the brightness level of the plaque area is less than the first critical value and equal to or greater than the second critical value, and the brightness values are evenly distributed. a data acquirer configured to obtain ultrasound data about an object having blood vessels; an image processor configured to extract a blood vessel area from an ultrasound image generated based on the ultrasound data, extract a plaque area (510, 520, 530) included in the blood vessel area, and analyze a risk of plaque based on a surface shape of the plaque area (510, 520, 530) and brightness information of the plaque area (510, 520, 530); and a display; characterized in that: the display is configured to display the risk of plaque; and the brightness information of the plaque area comprises a brightness level of the plaque area and a distribution state of brightness values in the plaque area, and the image processor is configured to determine the risk of plaque to be high when the brightness level of the plaque area is equal to or greater than a first critical value or less than a second critical value that is less than the first critical value and to determine the risk of plaque to be low when the brightness level of the plaque area is less than the first critical value and equal to or greater than the second critical value, and the brightness values are evenly distributed. the display is configured to display the risk of plaque; and the brightness information of the plaque area comprises a brightness level of the plaque area and a distribution state of brightness values in the plaque area, and the image processor is configured to determine the risk of plaque to be high when the brightness level of the plaque area is equal to or greater than a first critical value or less than a second critical value that is less than the first critical value and to determine the risk of plaque to be low when the brightness level of the plaque area is less than the first critical value and equal to or greater than the second critical value, and the brightness values are evenly distributed.