An NC device includes an additive manufacturing execution unit that controls an additive manufacturing process for producing a shaped object by stacking layers of a material melted, a subtractive manufacturing execution unit that controls a subtractive manufacturing process for cutting the shaped object using a tool, a status analysis unit that analyzes a machining status of the shaped object based on sensor data obtained by monitoring of the machining status of the shaped object produced by a combination of the additive and subtractive manufacturing processes, a production process change unit that outputs, to the additive and subtractive manufacturing execution units, a switching command that commands switching a production process, based on the analysis of the machining status, and a process condition generation unit that determines a process condition to be used in a production process after switching, based on a process condition used before the switching.