A numerical control device includes a multicore CPU for outputting a position command value of a servomotor, an ASIC including a servo controller, which outputs a current command value to an amplifier for driving the servomotor, and another processor, and a DSP for reading the position command value and controlling the servomotor such that the servomotor moves to a position indicated by the position command value. The CPU and the ASIC are connected through a plurality of serial interfaces.