Control device and control system

A control device, comprising:

• a receiving unit that receives output signals from a plurality of manufacturing machines, via a communication network;
• a noise-component extracting unit that extracts a common noise component contained in the output signals;
• and
• a noise-component removing unit that removes the extracted noise component from at least one of the output signals,
• wherein the noise-component extracting unit extracts the common noise component by selecting, from frequency spectra corresponding to each of the output signals, power that has the minimum value at each frequency to generate a common-power spectrum and applying a high-pass filter to the common-power spectrum.