A connection apparatus and a portable system thereof are connected to a traffic message channel (TMC) device through a universal serial bus (USB) port. The portable system includes a satellite navigation device for performing a positioning function through the global positioning system and displaying a traffic message through a display interface, a USB port connecting to the TMC device to transmit the traffic message to the satellite navigation device, and a switch device for determining whether the connecting device is a USB device or a TMC device and switching the transmission standard and power supply mode thereof.