Abstract: A telephone apparatus includes: a telephone circuit unit which communicates with another telephone apparatus; a memory unit which stores a telephone number of telephone apparatus; a communication processing unit which communicates with a control target apparatus to which a house code is to be set; and a control unit which controls communication processing unit to transmit the telephone number stored in memory unit to the control target apparatus as the house code. Telephone apparatus is connected to the control target apparatus through a dedicated line inserted into a dedicated line insertion unit.

Abstract: A receptacle 1 is provided with insertion detecting means 14 for detecting the connection of a device 2, a memory 12 for storing therein a house code, and a power line superposition communication means 11 for superposing the house code on a power line 4. The house code is automatically set in the device 2 when the device 2 is connected to the receptacle 1.