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In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b, g, j, n, IEEE802.16 (WiMAX), cellular networks. Using those different standardized wireless networks, the disaster information network can cover wider area. The proper communication links and routes can be selected based on the required network characteristic, such as electro-magnetic field strength, throughput, latency, packet loss rate and communication distance. User can continue to transmit/receive the disaster information in disaster area even though a part of the network infrastructure is damaged due to the disaster. In this paper, we designed and implemented a cognitive wireless network with currently available different wireless LANs and constructed a prototype system to evaluate the performance of the mobile router.