An ultrasound diagnosis apparatus comprising: a calculating unit for calculating a mechanical index corresponding to a depth value in a direction in which ultrasound travels from an ultrasound output part of a transmission transducer, a thermal index corresponding to the depth value and a scan line, and a thermal dose by accumulating the TI according the depth value, the scan line, and time; a visualization unit for generating an MI map in which a relationship between the calculated MI and the depth value is visualized in the form of a graph, a three dimensional TI map by representing the calculated TI corresponding to the depth value and the scan line sterically in a form of mesh, and a thermal dose map based on the accumulated TI by at least one form of colors, a contour, and a mesh; a display unit for displaying at least one selected from a group consisting of the MI map, the TI map, and the thermal dose map; a receiving unit for receiving a user input for a selection of a particular attenuation coefficient; and a controller for controlling a transmission voltage based on the selected attenuation coefficient by the user input, wherein the calculating unit is further configured to calculate the MI in consideration of the selected attenuation coefficient, wherein the receiving unit is further configured to receive a selection of a first region which is a region of interest in an ultrasound diagnosis region of the object, and wherein the controller is further configured to control a transmission voltage of the first region to a first transmission voltage so as to maintain the MI or an acoustic pressure value in the first region within a predetermined threshold range, and to control a transmission voltage of second region so that a transmission voltage of the second region other than the ROI in the ultrasound diagnosis region of the object is below the first transmission voltage. a calculating unit for calculating a mechanical index corresponding to a depth value in a direction in which ultrasound travels from an ultrasound output part of a transmission transducer, a thermal index corresponding to the depth value and a scan line, and a thermal dose by accumulating the TI according the depth value, the scan line, and time; a visualization unit for generating an MI map in which a relationship between the calculated MI and the depth value is visualized in the form of a graph, a three dimensional TI map by representing the calculated TI corresponding to the depth value and the scan line sterically in a form of mesh, and a thermal dose map based on the accumulated TI by at least one form of colors, a contour, and a mesh; a display unit for displaying at least one selected from a group consisting of the MI map, the TI map, and the thermal dose map; a receiving unit for receiving a user input for a selection of a particular attenuation coefficient; and a controller for controlling a transmission voltage based on the selected attenuation coefficient by the user input, wherein the calculating unit is further configured to calculate the MI in consideration of the selected attenuation coefficient, wherein the receiving unit is further configured to receive a selection of a first region which is a region of interest in an ultrasound diagnosis region of the object, and wherein the controller is further configured to control a transmission voltage of the first region to a first transmission voltage so as to maintain the MI or an acoustic pressure value in the first region within a predetermined threshold range, and to control a transmission voltage of second region so that a transmission voltage of the second region other than the ROI in the ultrasound diagnosis region of the object is below the first transmission voltage.