For example, "this book belongs to me", we say it like "this book is mine". この本は私のものです。 Depending on the context, "to belong to..." is translated …に属[ぞく]しています. (to belong to the group A = A グループに属しています) So we have to choose the appropriate translation for it thinking about the sentence/situation. I hope this was helpful.

Este libro pertenece a...