  A scheme to incorporate non-local polarizations into the dynamical mean-field
theory (DMFT) and a tailor-made way to determine the effective interaction for
the DMFT are systematically investigated. Applying it to the two-dimensional
Hubbard model, we find that non-local polarizations induce a non-trivial
filling-dependent anti-screening effect for the effective interaction. The
present scheme combined with density functional theory offers an ab initio way
to derive effective onsite interactions for the impurity problem in DMFT. We
apply it to SrVO3 and find that the anti-screening competes with the screening
caused by the off-site interaction.
