Provided are a digital broadcast network system for providing a widget service and an operating method thereof The digital broadcast network system includes a communication network, a broadcast terminal, and a broadcasting station system. The broadcasting station system provides widget advertisement contents, received from a widget content provider, to the broadcast terminal. The broadcast terminal outputs the received widget advertisement contents to a display unit in response to a widget display control signal, and transmits product purchase information to the broadcasting station system when receiving a purchase request signal for products included in the widget advertisement contents.