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The present disclosure provides a learning data acquisition apparatus and method for receiving, from each of a plurality of terminals, mixed data in which a plurality of pieces of learning data are mixed according to a mixing ratio, identifying the mixed data transmitted from each of the plurality of terminals according to an included label, and acquire re-mixed learning data for training a pre-stored learning model by re-mixing each identified label according to a re-mixing ratio configured in correspondence to the number of terminals having transmitted the mixed data, thereby enabling learning performance and security to be improved by re-mixing the mixed data transmitted from each of the plurality of terminals in a data mixing manner.