| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique that makes possible further reduction of the risk of data loss in a natural disaster or the like.SOLUTION: Portable devices 11, 21, 31, 41, and 51 belonging to a main network 100 store in a decentralized way data split into multiple sets, while portable devices 11, 21, 31, 41, and 51 belonging to a subnetwork store backup data to back up the data stored in the portable devices 11, 21, 31, 41, and 51 belonging to the main network 100. This decentralized storing can prevent the stored data from being lost by a natural disaster or the like.SELECTED DRAWING: Figure 1 |
