Abstract: There is provided an information operation management system having a high safety of the information stored. The system is a computer system performing user authentication and presenting electronic information attribution to the user. Electronic information on user authentication information and user attribution electronic information are respectively divided into division information, which are stored in separate files. When presentation of electronic information is requested, the electronic information on the user authentication information are collected from the files to restore the user authentication information, which is compared to the user authentication information inputted for performing authentication. When the authentication is successful, the user attribution electronic information are collected from the respective files so as to be restored and presented.