Numerical control device having improved servo control performance

A numerical control device comprising:

• a CPU for outputting a position command value of a servomotor;
• an integrated circuit including a servo controller for outputting 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, wherein
• the CPU and the integrated circuit are connected through a plurality of serial interfaces,
• the integrated circuit has a first internal bus connected to one of the plurality of serial interfaces, and a second internal bus connected to another one of the plurality of serial interfaces,
• the servo controller is connected to the first internal bus, and
• the other processor is connected to the second internal bus.