Only a few ways to really obtain a lower ping. I'm guessing you want lower pings for gaming.
Play on servers closer to your area, possibly get a new internet service provider or connection rate that has lower pings, don't use the internet besides the game you are trying to play.
If you are on a shared internet connection with other people in your house there are a few programs to optimize the ping for you, unfortunately they are not free.
This is one ping optimization program that I used and can confirm lowers your ping, or should I say "maintains" your ping at it's usual level as others in your house are using the internet, as in downloading/uploading.
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