Please guide me How Can i get JIS STD Electrical, mechanical symbols in autocad

Steal them from their respective programs?  That's how I got the electrical symbols into AutoCAD LT 2015 from a copy of AutoCAD Electrical 2012.

are these symbols available on web, 

No they are not.

then how & from where is can be steal, i dont have any referece of JIS Symbols. If any buddy having JIS symbol library blocks. please upload.

I doubt that someone is going to upload all those symbols.Check the CAD Blocks area of this website.  Maybe you'll find what you are looking for there.