To provide a backbone business system capable of managing business schedule easily and performing business processing smoothly.SOLUTION: A backbone business system comprises: a business information input acceptance processing unit for accepting input of business information on backbone business; a business information output processing unit for outputting a part or all of the business information, input of which has been accepted, to a screen in a calendar format; and a backbone business processing unit for performing processing for the business information. The business information input acceptance processing unit, regarding the business information, allows relative date to be set as output conditions for business processing.SELECTED DRAWING: Figure 1
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