PROBLEM TO BE SOLVED: To support environmental accounting to be carried out by a plurality of persons. SOLUTION: In the financial accounting and environmental accounting supporting device 11 connects financial data are related to a registration number by the financial accounting DB device 13 of the financial data as environmental cost data and registered in an environmental accounting DB device 14 according to adding-up instruction to an environmental cost received by the user associated with the registration of the financial data received from a user (a person in the financial section of a company A). An environmental accounting supporting device 12 receives environmental effect data which has to be added up to an environmental effect from a user (a person in the environmental section of registered person A) with the designation of environmental cost data registered in the DB device 14 and registers this to the DB device 14 in connection with designated environmental cost data.
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