Embodiments of the present disclosure provide an apparatus for adjusting displayed picture, comprising a video signal input means, a position measuring means, an image processing means and a video signal output means. Embodiments of the present disclosure further provide a display apparatus comprising the above apparatus for adjusting the displayed picture and a display method thereof. In the embodiments of the present disclosure, a position being concerned by viewer's eyes on the display screen is enlarged or a field depth of the position being concerned by the eyes on the display screen is increased when the viewer moves forward or tilts his/her body forward, such that the viewer can view the displayed picture more clearly, thus achieving an interaction between the displayed picture and the viewer.