Is a crocodile smarter than a human?
No! Although they say that, it is not true. They do stuff that is smarter, but it takes years of practice for them, and it takes us few days, weeks, or months so don't believe it.
How can a computer be smarter than a human? A human made the computer, so it's physically impossible. It may be better at stuff than humans, but you can't say it's smarter. Until computers can make computers and can learn to actually think for themselves, rather than thinking based on programming, THEN they will be smarter then humans.