1. An ultrasound diagnosis apparatus comprising: a controller configured to calculate a thermal index (TI) corresponding to a depth value in a direction in which ultrasound travels from an ultrasound output part of a transmission transducer and a thermal dose obtained by accumulating the TI according to the depth value, a scanline value, and time, and generate a thermal dose map in which the calculated thermal dose is visualized in the form of a graph; a display configured to display the thermal dose map; and a receiver configured to receive a user input for selection a particular attenuation coefficient, wherein the controller controls a transmission voltage based on the particular attenuation coefficient, tracks a varying location using a motion tracking method, and calculates the thermal dose at the varying location by accumulating the TI values tracked at the varying location over time, wherein the varying location is defined by using the depth value and the scanline value, wherein the controller is further configured to calculate a mechanical index (MI) and an acoustic pressure value corresponding to depth values in a direction in which ultrasound travels from the ultrasound output part of the transmission transducer, and generate an MI map in which a relationship between the calculated MI and the depth value is visualized in the form of a graph and an acoustic pressure map in which a relationship between the calculated acoustic pressure value and the depth value is visualized in the form of a graph, wherein the receiver is configured to receive selection of a first region, which is a region of interest (ROI), in a ultrasound diagnosis region of an 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 an MI or an acoustic pressure value in the first region within a predetermined threshold range and control a transmission voltage of a 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.