A machine tool management system, comprising: at least one machine tool having attached thereto a use monitoring device having a communication function for connecting to Internet, the machine tool being disposed at a location available to a specified or unspecified user; and a management device connecting to the Internet and communicating with the use monitoring device, the use monitoring device including: a usage information obtaining part obtaining information on usage of the machine tool; and a usage information transmission part transmitting the information on the usage of the machine tool obtained by the usage information obtaining part to the management device; the management device including: a use fee calculation part calculating, as a use fee, a cost corresponding to the usage of the machine tool received from the use monitoring device; and a settlement processing part executing a processing of charging the use fee calculated by the use fee calculation part to the user, characterized in that: the machine tool includes a basic mechanism, and includes, as associated facility and function to be used in machining performed with the machine tool, one or more selected from among an automatic programming apparatus, an interactive programming apparatus, a special cycle function, a tool measurement system, and a workpiece measurement system; the usage information obtaining part of the use monitoring device is configured to obtain information on usage of the associated facility and function as the information on the usage of the machine tool from the associated facility and function; the usage information transmission part of the use monitoring device is configured to transmit the information on the usage of the machine tool inclusive of the information on the usage of the associated facility and function obtained by the usage information obtaining part to the management device; the use fee calculation part of the management device is configured to calculate the use fee inclusive of a cost corresponding to the usage of the associated facility and function received from the use monitoring device; and the use monitoring device further includes a settlement processing part executing the processing of charging the use fee to the user in cooperation with the settlement processing part of the management device. at least one machine tool having attached thereto a use monitoring device having a communication function for connecting to Internet, the machine tool being disposed at a location available to a specified or unspecified user; and a management device connecting to the Internet and communicating with the use monitoring device, the use monitoring device including: a usage information obtaining part obtaining information on usage of the machine tool; and a usage information transmission part transmitting the information on the usage of the machine tool obtained by the usage information obtaining part to the management device; a usage information obtaining part obtaining information on usage of the machine tool; and a usage information transmission part transmitting the information on the usage of the machine tool obtained by the usage information obtaining part to the management device; the management device including: a use fee calculation part calculating, as a use fee, a cost corresponding to the usage of the machine tool received from the use monitoring device; and a settlement processing part executing a processing of charging the use fee calculated by the use fee calculation part to the user, characterized in that: a use fee calculation part calculating, as a use fee, a cost corresponding to the usage of the machine tool received from the use monitoring device; and a settlement processing part executing a processing of charging the use fee calculated by the use fee calculation part to the user, characterized in that: the machine tool includes a basic mechanism, and includes, as associated facility and function to be used in machining performed with the machine tool, one or more selected from among an automatic programming apparatus, an interactive programming apparatus, a special cycle function, a tool measurement system, and a workpiece measurement system; the usage information obtaining part of the use monitoring device is configured to obtain information on usage of the associated facility and function as the information on the usage of the machine tool from the associated facility and function; the usage information transmission part of the use monitoring device is configured to transmit the information on the usage of the machine tool inclusive of the information on the usage of the associated facility and function obtained by the usage information obtaining part to the management device; the use fee calculation part of the management device is configured to calculate the use fee inclusive of a cost corresponding to the usage of the associated facility and function received from the use monitoring device; and the use monitoring device further includes a settlement processing part executing the processing of charging the use fee to the user in cooperation with the settlement processing part of the management device.