Abstract: An accounting data generation apparatus includes a definition information storage unit, a business data acquisition unit, and an accounting data generation unit. The definition information storage unit stores definition information for generating a plurality of pieces of accounting data corresponding respectively to a plurality of accounting standards for each kind of business data created from data of a business system. The business data acquisition unit acquires the business data. The accounting data generation unit reads from the definition information storage unit definition information corresponding to the kind of the business data acquired by the business data acquisition unit, and generates a plurality of pieces of accounting data corresponding respectively to the plurality of accounting standards from the business data in accordance with the read definition information.