ITunes deleted things from my iPhone?

I had some music and some videos, which i wanted to put in my iPhone 5 via iTunes. I had to delete them to add new ones.
How do i restore a backup? Meaning that how do i bring the things back?

I'm not using iphone, so i don't knew much about the itunes. Do you want to recover your files in iphone5? Maybe, it is for you!
http://mac.powerdatarecovery.com/