Voice data processing apparatus, and a wiring system using the same apparatus

It provides a compact voice information processing device excellent in a howling preventing effect, a wiring system which functions excellent replacement ease and scalability using the device. The processing device, speaker and the first microphone and a second microphone are arranged on the outer circumference outside of the diaphragm of the speaker, the speaker mixed in the output of the second microphone is positioned so as to face the diaphragm of the speaker the output sound component, and a signal processing unit for removing using the output of the first microphone, and particularly preferably used in the wiring system for transmitting information and electric power between the plurality of locations of buildings.