When the power off switch 264 is depressed, the interrupt generating circuit 40 of the NC unit 100 for generating an interrupt in the NC unit 100, and the termination of the power supply unit 5 are notified to the DS output circuit 16 by confirming the termination request to the PC unit 200 and confirming the termination notification from the PC unit 200 The PC end down means 51 of the NC unit 100 and the PC power down processing unit 220 of the PC unit 200 which forcibly terminates the application program and the operating system of the PC unit 200 after the termination request from the PC termination confirmation means 51 of the NC unit 100 is detected and operand The system comprises a BIOS 201 for confirming the termination of the system and for terminating the termination of the NC unit 100. For this reason, in the PC incorporated numerical control device, the power source is turned off safely without destroying the external storage device such as a hard disk storage device.
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