An ultrasound data acquisition unit configured to transmit ultrasound signals to a target object and receive ultrasound echo signals reflected from the target object to thereby acquire ultrasound data a display unit including a monitor and being configured to display an ultrasound image a sensing unit installed on one side of the monitor and being configured to detect a position of a user, a distance between the user and the monitor, a height of the user with respect to the monitor and a viewing angle of the user toward the monitor to thereby form and output sensing signals corresponding thereto a storage unit configured to store optimal posture information for providing an optimal ultrasound image for the posture of the user and a processing unit coupled to the ultrasound data acquisition unit, the sensing unit and the storage unit the processing unit being configured to form the ultrasound image by using the ultrasound data and perform an optimal image processing for the posture of the user upon the ultrasound image based on the sensing signals and the optimal posture information.
