Abstract: A smart touch set-top box device comprises a touch screen, a LCD, a microprocessor, a television signal processing unit, a speaker, a wireless communication unit and an Ethernet communication unit, wherein the touch screen is arranged on the front end of said LCD for detecting the touch location of a user and transmitting a touch sensing signal to said microprocessor, the microprocessor is used for converting said touch sensing signal to operational order, controlling said television signal processing unit to communicatively connect with external device by driving said wireless communication unit or Ethernet communication unit, thereby realizing the synchronously play of audio and video signal on multi-screens. A smart network multimedia playing system sends wireless signal by mobile terminal to control the operation of said set-top box, thereby realizing the synchronously play of audio and video data on the own device of the set-top box and external television.