The present invention relates to a system for quantitatively evaluating and predicting the sustainability of a building, and a system for automatically selecting a main building material inputted as a variable and evaluating the degree of influence of the selected building material on the environment according to a scenario. The present invention relates to an automatic apparatus for evaluating the life cycle of a building, which is applied to a system for evaluating the sustainability of the entire life cycle of a building using an input amount of a major building material, An input unit for receiving a code of a plurality of building materials related to the type and the quantity; A database unit for storing unit weights of a plurality of building materials for each code of the plurality of building materials; An operation unit that receives codes of the plurality of building materials from the input unit and calculates a total weight for each building material by a unit weight and code of each building material stored in the database unit to derive a plurality of total weights; And a material selection unit for selecting the main building material in descending order of the total weight ratio of each building material with respect to the total sum of the plurality of total weights derived from the calculation unit.
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