Abstract: [Problem] To provide a file management system and file management method that are able to perform a backup process efficiently by means of a configuration that uses a virtual file system metadatabase from a backup process side also. [Solution] The file management system is provided with a virtual drive controller (110) that controls a virtual drive (5), a metadatabase (210) that contains information for associating a virtual file and a physical file that is saved in a storage device (6), a backup controller (120) that manages the backup process of a file, and a backup status management database (220) used in backup process management. The virtual drive controller (110) registers updated file information in the backup status management database (220). The backup controller (120) references the backup status management database (220) and the metadatabase (210), and backs up the file.

Abstract: [Problem] To provide a file management system and file management method that are able to perform a backup process efficiently by means of a configuration that uses a virtual file system metadatabase from a backup process side also. [Solution] The file management system is provided with a virtual drive controller (110) that controls a virtual drive (5), a metadatabase (210) that contains information for associating a virtual file and a physical file that is saved in a storage device (6), a backup controller (120) that manages the backup process of a file, and a backup status management database (220) used in backup process management. The virtual drive controller (110) registers updated file information in the backup status management database (220). The backup controller (120) references the backup status management database (220) and the metadatabase (210), and backs up the file.

Abstract: A message transmission and reception controlling method is provided which is excellent in certainty, reliability and confidentiality and in which the situation of a message as transmitted can always be confirmed by each of the sender and the addressee. Message property information H is generated from the message M to define the message M in correspondence with the user who transmits the above described message M and the user who receives the message M. The user can receives the message body information C as defined in the message property information H by browsing the message property information H. The message property information H belonging to the user as the sender and the message property information H the user as the addressee are updated in synchronism with the access to the message body information C so that it is possible to confirm the message transmission and reception situation of the message body information C by browsing the message property information H.

Abstract: A message transmission and reception controlling method is provided which is excellent in certainty, reliability and confidentiality and in which the situation of a message as transmitted can always be confirmed by each of the sender and the addressee. Message property information H is generated from the message M to define the message M in correspondence with the user who transmits the above described message M and the user who receives the message M. The user can receives the message body information C as defined in the message property information H by browsing the message property information H. The message property information H belonging to the user as the sender and the message property information H the user as the addresee are updated in synchronism with the access to the message body information C so that it is possible to confirm the message transmission and reception situation of the message body information C by browsing the message property information H.