1. An amplitude shifted information embedding method based upon phase equalization that embeds information into an image by generating energy change from shifts in subband images, the method comprising the steps of: determining a plurality of key values; performing a conversion on an original image; adjusting coefficients of each of the matrix coefficients to satisfy an equalization function; performing an inverse operation on the original image; adjusting a plurality of subbands corresponding to the matrix coefficients according to a shifted value; and generating an information embedded image.