To provide a basic business system that can easily manage business schedules and that can smoothly execute business processes. A basic business system includes a business information input reception processing unit that receives input of business information related to a basic business, and a business information output processing unit that outputs a part or all of the input business information on a calendar format screen. And a core business processing unit that executes processing on business information. In the business information, the business information input reception processing unit can set a relative date as an output condition setting in the business process. [Selection] Figure 1
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