An operation management system is constituted by a management server and a plurality of machine tools connected to each other through a network. The management server manages the operation state of each of the machine tools, and the work schedule of an operator who performs work with the machine tools determines a machine tool to be used by the operator in a next work process based on messages from the machine tools and the work schedule of the operator , and instructs each of the machine tools to generate a display content for directing the operator to the particular machine tool.
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