A terminal device, network system and controlling method thereof are provided. The present invention includes an input unit configured to receive an input of a command, a controller recognizing the inputted command and detecting state information, and a communication unit transmitting the detected state information by broadcasting and receiving state information of an external device from the external device by the broadcasting, the controller comparing the detected state information to the received state information of the external device such that if a priority of the detected state information is high, the controller executes the recognized command, and if the priority of the detected state information is low, the controller does not execute the recognized command.