Add-on communication apparatus attached to cable installment type charging control device

An add-on communication device attached to a cable installment type charging control device attached to a cable assembly for charging an electric vehicle is disclosed. The add-on communication device includes a first communication unit wirelessly communicating with a terminal device, a second communication unit wirelessly communicating with the cable installment type charging control device, and a control unit. The control unit receives a command from the terminal device through the first communication unit, creates a first control command on the basis on the command, and transmits the first control command to the cable installment type charging control device through the second communication unit.