1. A system for managing electronic data, comprising: an identification data storage unit storing (i) identification data identifying specific electronic data stored in data storage, (ii) associated information identifying one or more associated data files associated with the specific electronic data, and (iii) distribution authorization information identifying users having authorization to distribute the one or more associated data files; a user authentication data storage unit storing user authentication information for identifying and authenticating users; an output unit configured to output a visible image corresponding to the specific electronic data, and add to the visible image an identification image based on the identification data identifying the specific electronic data; an identification recognition unit configured to detect the identification image in the visible image, recognize the identification data from the detected identification image, and determine said one or more associated data files associated with the specific electronic data, based on the associated information; and a data sending unit configured to send said one or more associated data files associated with the specific electronic data and corresponding to the recognized identification data to one or more of authorized destinations specified by a user, after the user is authenticated based on the user authentication information and is determined based on the distribution authorization information to be authorized to send the one or more associated data files.