To provide a technology capable of communication among three points or over by using communication units for permitting one-to-one communication.

A communication unit connection apparatus is provided with: connection apparatus side communication units 32, 34, 36 respectively connected to point side communication apparatuses 12, 14, 16 and for respectively executing one-to-one transceiving with the point side communication apparatuses 12, 14, 16; and an MCU 40 that receives a signal received by the connection apparatus side communication unit 32, transmits the signal to the point side communication apparatuses 14, 16 other than the point side communication apparatus 12 connected to the connection apparatus side communication unit 32, receives a signal received by the connection apparatus side communication unit 34, transmits the signal to the point side communication apparatuses 12, 16 other than the point side communication apparatus 14 connected to the connection apparatus side communication unit 34, and receives a signal received by the connection apparatus side communication unit 36, transmits the signal to the point side communication apparatuses 12, 14 other than the point side communication apparatus 16 connected to the connection apparatus side communication unit 36.