1. An information burying apparatus that buries a dot pattern corresponding to buried information on an image, comprising: a storing unit configured to store, with dots of the dot pattern two-dimensionally arrayed and repeated generally at a predetermined period, plural dot patterns by shifting positions of the respective dots from positions at the predetermined period by a very small amount; a selecting unit configured to select a dot pattern according to buried information out of the plural dot patterns in the storing unit; and a superimposing unit configured to superimpose the dot pattern selected by the selecting unit on the image.