Mobile Ad Hoc Networks (MANET) is a useful means instead of network infrastructure when disaster happens. The existing Simple Flooding (SF) causes redundant message transmission, performance degradation and waist of finite battery resources. Making network lifetime without external energy source as long as possible is one of the main goals in case of any disasters or emergency situations. We propose a new broadcasting method that allows reducing power consumption by decreasing a number of redundant re-broadcastings, "Effective Flooding based on Neighbor information Exchange (EFNEX)". Through computer simulation, we showed the effectiveness of our method compared with existing Simple Flooding.%4章の結果より,EFNEXは大幅な冗長パケツトの削減に成功したが,ネットワーク内の35％のノードに情報を届けることができなかった。緊急時に,ネットワーク內のできるだけ多くの人たちに情報をできるだけ効率よく （電力消費を減らして）届けるという本来の目的に照らして,EFNEXがその役目を十分果たしているか検討の余地がある。
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