Near real time monitoring system utilizing earth observation satellite constellation is expected for disaster management. However, these satellites may not have sufficient time to transmit all of their observed data to a ground station because low earth orbit (LEO) satellites pass over a ground station for a few minutes. Therefore, if the satellite stores more data than the size of transmission data to a ground station, it needs to transmit residual data after approaching other ground stations. As a result, it causes lack of timeliness due to the overhead time for fine tracking between a satellite and a new target of ground station. To deal with above mention, this paper proposes novel routing method to improve transfer ratio of whole observed data in a contact time. Relative to the conventional method which transmits data to a ground station, the proposed method divides observed data and modulates them as multi-carrier signals so as to distribute to two or more ground stations by multi-hop relaying. Furthermore, the satellite of this system switches inter-satellite link and satellite-to-ground link for own data and other satellite's data utilizing channelizer dynamically. The effectiveness of our proposal is verified through simulation results.