Disclosed herein is a method for analyzing 2-dimensional geothermal resource data using a web-based 3-dimensional sectional view, to implement an analyzing module performing 3-dimensional section analysis for 2-dimensional geothermal resource spatial data as a program run by data processing devices including a computer. The method for analyzing 2-dimensional geothermal resource data using a web-based 3-dimensional sectional view is configured by the processes of: selecting an analysis target region and generating linear vector data; requesting a section analysis layer of GeoServer for the target region; generating a dynamic query for a section analysis according to the delivered conditions, and executing PostGIS, an open source GIS software; delivering a result of the sectional view analysis executed by PostGIS to OpenLayers, and generating a section analysis results chart to display it on the Web; and displaying the sectional view analysis chart as a pop-up window.