I want to use my sony cybershot DSC S730 as a webcam.It has video and audio output as given in image.so please help me.

The short answer is NO.

The USB interface is made to work as a mass storage device. It doesn't have the hardware to support video streaming.

iceng1 year ago

Point it at yourself plug it into your computer down load cam software URL and face-time a friend or skype with someone