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When a large-scale disaster occurs, information sharing among administration, residents, and volunteers is indispensable. However, as reported, a lot of examples show that it is difficult to use well. The Disaster Information System is not built on the infrastructure which the system failure was considered at the disaster is nominated for the cause. In this study, we focus on the operation usability of the Disaster Information Sharing Systems works at each area, and share the resources of those systems with the P2P overlay network, by decentralizing and integrating the disaster information to realize the redundancy of the system. For the disorder between the nodes and the communication links, we propose a mechanism to detect the faults in order to improve the robustness of the system.