  We investigate the dynamics of information in isolated multi-qubit systems.
It is shown that information is in not only local form but also nonlocal form.
We apply a measure of local information based on fidelity, and demonstrate that
nonlocal information can be directly related to some appropriate well defined
entanglement measures. Under general unitary transformations, local and
nonlocal information will exhibit unambiguous complementary behavior with the
total information conserved.
