A display method for a display device having a lens unit and a display unit, comprising steps of: detecting, by a distance measurement unit, a first distance (d) between the lens unit and the display unit; calculating correction information according to the first distance (d) and transmitting the correction information to the display unit (S62A); and displaying a corrected image by the display unit according to the correction information, so that the corrected image is converged into eyes of a user via the lens unit, wherein the corrected image is obtained by correcting an original image according to the first distance (d) (S63A); characterised in that the distance measurement unit is provided at an edge of the lens unit and at one end of a diameter of the lens unit, to not be vertically pointed to the display unit along a predetermined direction, the predetermined direction and a direction of the first distance (d) form an angle θ, and the distance measurement unit comprises a distance sensor and a calculator; the detecting the first distance (d) between the lens unit and the display unit comprises: detecting a second distance in the predetermined direction between the lens unit and the display unit using the distance sensor fixedly coupled to the lens unit; and calculating the first distance (d) according to the predetermined direction and the second distance; and the calculating the first distance (d) according to the predetermined direction and the second distance comprises: calculating, by the calculator, the first distance (d) by a formula of d=(S+S 0)*cosθ, where d is the first distance, S is the second distance, and S 0 is a distance in the predetermined direction between a distance measurement starting point of the distance sensor and a center plane of the lens unit. detecting, by a distance measurement unit, a first distance (d) between the lens unit and the display unit; calculating correction information according to the first distance (d) and transmitting the correction information to the display unit (S62A); and displaying a corrected image by the display unit according to the correction information, so that the corrected image is converged into eyes of a user via the lens unit, wherein the corrected image is obtained by correcting an original image according to the first distance (d) (S63A); characterised in that the distance measurement unit is provided at an edge of the lens unit and at one end of a diameter of the lens unit, to not be vertically pointed to the display unit along a predetermined direction, the predetermined direction and a direction of the first distance (d) form an angle θ, and the distance measurement unit comprises a distance sensor and a calculator; the detecting the first distance (d) between the lens unit and the display unit comprises: detecting a second distance in the predetermined direction between the lens unit and the display unit using the distance sensor fixedly coupled to the lens unit; and calculating the first distance (d) according to the predetermined direction and the second distance; and the calculating the first distance (d) according to the predetermined direction and the second distance comprises: calculating, by the calculator, the first distance (d) by a formula of d=(S+S 0)*cosθ, where d is the first distance, S is the second distance, and S 0 is a distance in the predetermined direction between a distance measurement starting point of the distance sensor and a center plane of the lens unit.