Provided are a system for supporting the establishment of urban planning and a method for providing urban planning information. The method for providing urban planning information comprises: a step of acquiring geographic basic information about an area to be analyzed; a step of analyzing the geographic basic information to obtain a first analysis result including flood analysis information; a step of displaying the first analysis resu a step of determining an area to be developed for urban planning in the area to be analyzed; a step of analyzing the geographic basic information again based on the set area to be developed to obtain a second analysis result including flood analysis information; and a step of displaying development effect information including information on the reduction in a flooded area by comparing the first analysis result and the second analysis result.
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