If a person lives in his unreal world, how to pull him to reality?

Reality problems. The only treatment to help a person who loses touch with reality is medication. This is only after any possible medical or physical problems are ruled out. A psychiatrist who is board certified is best.
Professional help. The difficulty is trying to speak rationally to an irrational person; this is not easy and best left for the professionals. Seek the care of a psychiatrist or psychologist.