I need some tool, framework or something like that to access two or more diferente databases with relacioned data in the databases.
This needs to be made in Java.
Somebody knows how can I do that easily possible?

Sorry about my English!

That's built into Java.
It's called JDBC. You just need the JDBC driver(s) for the database(s)

http://java.sun.com/docs/books/tutorial/jdbc/index.html