1. An information processing apparatus comprising: an image display means for displaying an original digital input image, and for outputting information on a size of the image; a point of interest specifying means for specifying a point of interest in the original digital input image currently displayed on a basis of an inputted instruction; a related information output means for inputting related information on said point of interest, and for outputting a text of the related information; an additional information conversion means for converting the text of said related information to additional information and outputting this additional information, and for outputting an amount of the additional information on said each point of interest; an embedding region allocating means for outputting region management information including said amount of additional information, for allocating an embedding region for said additional information in said original digital input image on a basis of said image size information and said amount of the additional information, and for outputting information on said embedding region as region information; and an embedding information means for embedding said region management information in a predetermined region in said original digital input image, and also embedding said additional information in said original digital input image on a basis of said region information to generate and output an watermarked image.