Abstract: There is provided a digital device control system using a smart phone, including a smart phone having an application of a remote control function, a digital device of which on/off of a power supply, channel or volume is controlled according to a signal received from the smart phone, and an IR repeater functioning as a central control unit connected to the smart phone through Bluetooth or Wi-Fi communication and connected to the digital device through a plurality of infrared ray communications in order to remotely control the digital device, and therefore, the digital device can be controlled using the smart phone instead of a remote controller.