Is there any legal way or application on facebook?

[jaya]

How to know tht someone had visited & see ur profile.

[Azayles]

No. The privacy policy on facebook prevents this, anyway. So the facebook developer API will never include this functionality.
Programs that claim to work, are fake, and simply exist to harvest facebook details to spam or advertise.

[Oree Azar]

u cannot check this on facebook i think, the only option u have is customizing your privacy settings, so that your profile can b seen by only people, to whom u allow to see.