1. A three-dimensional television broadcasting system comprising: a three-dimensional imaging system, wherein the imaging system generates a three-dimensional image data comprising two-dimensional all-in-focused image and depth information; an audio/visual signal transmission system, wherein the transmission system transmits a data signal carrying the three-dimensional image data comprising two-dimensional all-in-focused image and depth information; and a displaying system, wherein the displaying system is a three-dimensional display device having at least one micromirror array lens comprising a plurality of micromirrors, wherein a focal length of the micromirror array lens is changed by controlling rotation and translation of the micromirrors; wherein the displaying system receives the transmitted data signal and restores the three-dimensional image data as a three-dimensional image by changing the focal length of the micromirror array lens.