| 摘要 |
There are disclosed an apparatus and a method for managing data of rental contracts with a plurality of customers. The apparatus is provided with a storage, an input device, and a controller. The storage stores a plurality of contract data, each of which includes a customer ID, item IDs, numbers of items to be applied to rental contracts, a data table of discount rates, dates of the rental contracts, and terms of the rental contracts. The input device receives input of new data, each of which includes a new customer ID, new item IDs, new numbers of items to be applied to new rental contracts, application dates of the new rental contracts, and new terms of the new rental contracts. The controller reads out and sums up the numbers of the items.
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