This machine tool management system is configured to include a plurality of terminals that each receive modifications to settings for a machine tool by an operator. One of the plurality of terminals has modification rights, i.e., rights to modify the settings of the machine tool. Modifications to the settings of the machine tool are accepted only from the terminal having modification rights among the plurality of terminals. The modification rights are transferred between the plurality of terminals. The present invention thus has the advantage of increasing the degree of freedom with respect to the place and time at which settings are modified, and it is possible to prevent data from being modified unbeknownst to an operator as a result of configuring so that only one terminal is capable of modifying the settings of the machine tool.