Spraying an insecticide (such as Suspend or Talstar) around the perimeter of your home will not also take care of termites. Termites are subterranean and attack your house through the dirt. The only way to get them is with a treatment by using the trench method below.
You should perform a liquid termite treatment in the ground to get the termites where they are entering your house or for preventative treatments. To perform a treatment just as a professional company would do, please read our How To Do A Termite Treatment Article which explains exactly how you should treat your home properly. Doing a treatment like what is described in the article will not only take care of existing termites that you have, but it will also protect and prevent future termites from entering for about 7-10 years.
Here is a link to the article: http://www.domyownpestcontrol.com/termite-treatment-c-3_352.html
If you have live termites in your home, it is best to treat directly using one of the products found at the following link: