PURPOSE: A system for supporting decision of R&D(Research and Development) investment using a database and a method thereof are provided to analyze/estimate a value of an investment plan based on a consistent standard by constructing the database with R&D related information and offering systematic information from the database. CONSTITUTION: The internal database(20) receives/stores data for an R&D theme from a user terminal(200). A decision support server(10) receives the data from the user terminal and searches/estimates/stores the data in the internal database. The data includes a project classification, an R&D stage, a technology lifecycle, a keyword, and an R&D expense. The internal database includes a preliminary estimation database(24) for storing a preliminary estimation result for one estimation item of the data received from the user terminal.
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