A display apparatus according to this invention performs control so as to reduce the difference between image data input to a display unit and an image which is displayed on a display surface and acquired by {HEAD ~ an acquisition unit}, based on the image data and {TAIL ~ the image} 
based on
A display apparatus according to this invention performs control so as to reduce the difference between image data input to a display unit and an image which is displayed on a display surface and acquired by { HEAD ~ an acquisition unit } , based on the image data and { TAIL ~ the image }
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