1. A tomosynthesis system, comprising: a vacuum chamber; a plurality of X-ray sources configured to be coupled to the vacuum chamber, the plurality of X-ray sources having an emitting face that is outside of the vacuum chamber to generate X-rays in a direction of a subject; and an image sensor configured to detect X-rays that pass through the subject; wherein the plurality of X-ray sources are disposed at the outside of the vacuum chamber so as to be apart from each other and sequentially emit the X-rays in the direction of the subject at different angles.