PROBLEM TO BE SOLVED: To achieve the efficient determination of a production schedule.SOLUTION: In a support system 10 of the determining work of a production schedule to be used in a process for consecutively processing production units to manufacture a product, the support system 10 includes a display unit 11 which can be confirmed by an operator M and an input device 12 which can be operated by the operator M, and a production schedule area in which production items showing the content of production units are arranged in the order of processing and a production priority area in which the production items are displayed in accordance with the priority of the production units are set in the display unit 11. The priority of production is evaluated with two or more parameters, and the production items are arranged in accordance with the evaluated production priority, in the production priority area of the display unit 11. When the input device 12 is operated by the operator M, the production items arranged in the production priority area are rearranged in the production schedule area, and the determination work of the production schedule is performed.
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