1. A depth map enhancing method, comprising: obtaining an original depth map and a depth related parameter, and storing said original depth map and said depth related parameter into a storage medium; quantifying a gray level value of every pixel in said original depth map between 0 and 1 to obtain a plurality of quantified gray level values; raising said depth related parameter to a power of every said quantified gray level value respectively, subtracting 1, and then divided by the value of said depth related parameter subtracting 1, and multiplied by a max gray level value to obtain a plurality of depth-relation-enhanced gray level values; and evenly distributing said plurality of depth-relation-enhanced gray level values between 0 and said max gray level value according to the relative proportional relationship among said plurality of depth-relation-enhanced gray level values to obtain a plurality of final gray level values.