A multi-focal display apparatus for outputting a converged image, the apparatus comprising: a first display of which an optical focal distance is a first distance, configured to generate a first image; a second display of which an optical focal distance is a second distance, configured to generate a second image; a processor configured to: obtain a depth value of an image to be output; determine a first value of a first pixel of the first display and a second value of a second pixel of the second display according to the obtained depth value of the image to be output and the first and second distance by: normalizing the depth value of the image to be output; determining a weight corresponding to the first display and the second display by modulating the normalized depth value using a look up table, LUT, provided using a depth value modulation function, wherein the depth value modulation function includes a sigmoid function; and determining the first value of the first pixel of the first display and the second value of the second pixel of the second display according to the corresponding weight, the second pixel having a position corresponding to a position of the first pixel; and control the first display to output the first image with the first pixel having the determined first value, and control the second display to output the second image with the second pixel having the determined second value; and an image converging member configured to overlap the first pixel output by the first display and the second pixel output by the second display and output a converged image corresponding to the image to be output with the obtained depth value. a first display of which an optical focal distance is a first distance, configured to generate a first image; a second display of which an optical focal distance is a second distance, configured to generate a second image; a processor configured to: obtain a depth value of an image to be output; determine a first value of a first pixel of the first display and a second value of a second pixel of the second display according to the obtained depth value of the image to be output and the first and second distance by: normalizing the depth value of the image to be output; determining a weight corresponding to the first display and the second display by modulating the normalized depth value using a look up table, LUT, provided using a depth value modulation function, wherein the depth value modulation function includes a sigmoid function; and determining the first value of the first pixel of the first display and the second value of the second pixel of the second display according to the corresponding weight, the second pixel having a position corresponding to a position of the first pixel; and control the first display to output the first image with the first pixel having the determined first value, and control the second display to output the second image with the second pixel having the determined second value; and obtain a depth value of an image to be output; determine a first value of a first pixel of the first display and a second value of a second pixel of the second display according to the obtained depth value of the image to be output and the first and second distance by: normalizing the depth value of the image to be output; determining a weight corresponding to the first display and the second display by modulating the normalized depth value using a look up table, LUT, provided using a depth value modulation function, wherein the depth value modulation function includes a sigmoid function; and determining the first value of the first pixel of the first display and the second value of the second pixel of the second display according to the corresponding weight, the second pixel having a position corresponding to a position of the first pixel; and normalizing the depth value of the image to be output; determining a weight corresponding to the first display and the second display by modulating the normalized depth value using a look up table, LUT, provided using a depth value modulation function, wherein the depth value modulation function includes a sigmoid function; and determining the first value of the first pixel of the first display and the second value of the second pixel of the second display according to the corresponding weight, the second pixel having a position corresponding to a position of the first pixel; and control the first display to output the first image with the first pixel having the determined first value, and control the second display to output the second image with the second pixel having the determined second value; and an image converging member configured to overlap the first pixel output by the first display and the second pixel output by the second display and output a converged image corresponding to the image to be output with the obtained depth value.