A digital breast tomosynthesis system includes an object fixing unit including first and second fixing plates, a first vibration plate moved in linkage with the first fixing plate and a second vibration plate moved in linkage with the second fixing plate, and configured to fix the object between the first and second vibration plates, an X-ray generator configured to project X-ray toward the object; an X-ray detector configured to detect the X-ray, a vibration generating device configured to vibrate the first and second vibration plates at a set frequency, and a vibration control device configured to control the vibration generating device by generating a vibration signal corresponding to the set frequency, wherein the X-ray generator projects the X-ray at specific time intervals on the basis of the set frequency.