| 摘要 |
PURPOSE:To prevent deterioration of the data processing performance by using a time point included in data updating an image journal record as a merge key to a merge the updating image journal record outputted from each computer via a merge means. CONSTITUTION:The coincidence of time points is secured by a time point coincidence mechanism 3 between the CPU built-in timepieces 11 and 21 of computers 1 and 2, respectively. The record production means 13 and 23 of computers 1 and 2 outputs the data updating image journal records including the time points read by a time reading means 12 and 22 when the computers 1 and 2 update the data records stored in a data recording medium. Thus it is possible to know a specific order in which the data record stored in a data memory medium 5 is updated based on the time point included in the data updating image journal record. Then the time point in said journal record is used as a merge key to merge said journal records outputted from both computers 1 and 2.
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