The embodiments of the present disclosure disclose an apparatus and method for adjusting display parameters and a display apparatus. According to the embodiments of the present disclosure, the apparatus for adjusting display parameters comprises: an input unit configured to receive first display parameters from a first display and receive second display parameters from a second display; a control unit configured to obtain reference display parameters according to the first display parameters, compare the reference display parameters with the second display parameters, and adjust the second display parameters according to a comparison result; and an output unit configured to output the adjusted second display parameters to the second display as display parameters of the second display.