1. An ultrasonic diagnostic apparatus comprising: a data generating unit that transmits an ultrasonic wave to a predetermined region of a tested body and generates first ultrasonic image data on the basis of a reflected wave from the tested body; a determination unit that generates second ultrasonic image data, the resolution of which is lower than that of the first ultrasonic image data, using the first ultrasonic image data and determines an effective diagnostic component and an ineffective diagnostic component on the basis of the second ultrasonic image data; a coefficient deciding unit that decides correction coefficients of the ineffective diagnostic component and the effective diagnostic component of the first ultrasonic image data such that a signal value or pixel value of the effective diagnostic component is relatively emphasized compared with a signal value or pixel value of the ineffective diagnostic component; and a multiplication unit that executes image correction processing by multiplying the ineffective diagnostic component and the effective diagnostic component of the first ultrasonic image data by the correction coefficients.