An example of the present invention provides a dongle system including a dongle terminal, the dongle terminal comprising: a dongle terminal unit including a dongle data terminal for data communication with an external product, a dongle power terminal for receiving power supply from the external product, and a dongle antenna terminal for connection with an antenna unit which is installed in the external product and is wirelessly connected to an external server and the Internet of things; a dongle data communication processing unit connected with the dongle data terminal so as to process data communication with the external product; a wireless communication processing unit connected with the dongle antenna terminal so as to process wireless communication with the external server, and to receive, from the external server, a first product control signal for providing an Internet of things service to the external product; and a product service software unit having dongle software installed therein, processing the first product control signal received through the wireless communication processing unit and transmitting the same to the dongle data communication processing unit, and transmitting, to the dongle data communication processing unit, a second product control signal which is generated through the dongle software so as to control the external product.