A sharing device includes a central processing unit, an input jack unit, a video and audio coding and decoding unit, a video and audio output module, and a wireless receiving and transmitting unit; the input jack unit includes USB ports, and a RJ-45 jack; the video and audio output module has output jacks to be connected to broadcasting devices for images and audio signals to be output and broadcasted; the sharing device can be connected to internet to obtain video and audio data; or alternatively, the sharing device can obtain video and audio signals from other broadband routers, video and audio sharing devices, IP sharers or wireless stations; the sharing device can be connected to internet to serve as a router so that nearby computers can have access to internet; several such sharing devices can be positioned within transmission range of each other to form a local area network.