Can I connect my home theater to PC?

yes, you could connect it one of 2 ways. you could use a 3.5mm to RCA connector, and connect to the RCA Aux input on the back, or you could go 3.5mm to 3.5mm cable and connect to the mp3 input on front.
 
Set the PC to 2 channel output since that is the only input you have on the HTS. Set that for a surround mode that works for stereo sources.