His is the possessive form of he, which can be used in the following ways:
as a possessive determiner (followed by a noun): He gave me his address.
as a possessive pronoun (without a following noun): My computer didn’t cost as much as his. As a possessive pronoun his can refer to a singular or plural noun, and it can be the subject, object, or complement of a verb or the object of a preposition: ♦ My car is a Ford, but his is a Fiat. ♦ I deal with my problems and he deals with his.