  We study the entanglement among sequential Hawking radiations in the
Parikh-Wilczek tunneling model of Schwarzschild black hole. We identify the
part of classical correlation and that of quantum entanglement in bipartite
information and point out its imitated relation to quantum gravity correction.
Explicit computation of n-partite information shows that it is positive
(negative) for even (odd) $n$, which happens to agree with the holographic
computation. The fact that entanglement in the mutual information grows with
time mimics the second law of thermodynamics. Later we extend our study to the
AdS black hole and find the total mutual information which includes the
classical correlation is sensible to the Hawking-Page phase transition.
