INFORMATION MANAGEMENT SYSTEM

PROBLEM TO BE SOLVED: To provide accurate information from a main system to a sub system as early as possible even when removed from duplex processing. SOLUTION: An active device attaches a sequence number showing a notification order to update record information that records that data are stored, notifies a standby device of the update record information through a communication line, and accumulate the update record information when the completion of the notification of the update record information cannot be confirmed. When receiving a retransmission request for the update record information from the standby device, the update record information is notified again. The standby device monitors the update record information notified from the active device, and detects reception omission of the update record information on the basis of the regularity of sequence numbers attached to respective update record information. When the reception omission of the update record information is detected, the retransmission of the update record information is requested, and information on the matching of data stored between in a first storing means of the active device and in a second storing means of the standby device is notified on the basis of a sequence number to be attached to the update record information with the reception omission. COPYRIGHT: (C)2010,JPO&INPIT