  We investigate the two-orbital Hubbard model, which reproduces the electron
and hole Fermi surfaces in the iron pnictide superconductors, in the presence
of the Jahn-Teller electron-phonon coupling by using the dynamical mean-field
theory. When the intra- and inter-orbital Coulomb interactions, $U$ and $U'$,
increase with $U=U'$, both the local spin and orbital susceptibilities,
$\chi_{s}$ and $\chi_{o}$, increase with $\chi_{s}=\chi_{o}$ because of the
spin-orbital symmetry. Due to the Hund's rule coupling $J$, $\chi_{s}$ is
enhanced and dominates over $\chi_{o}$ resulting in the repulsive local pairing
interaction $V_{\rm loc}>0$, while due to the electron-phonon coupling $g$,
$\chi_{o}$ is enhanced and dominates over $\chi_{s}$ resulting in the
attractive one $V_{\rm loc}<0$ which induces the intra-orbital s-wave pairing.
Remarkably, $V_{\rm loc}$ is weakly dependent on doping and can be attractive
for heavily electron-doped regime where the superconductivity is observed
without Fermi surface nesting.
