  X-ray and near-infrared ($J$-$H$-$K_{\rm s}$) observations of the Galactic
black hole binary GX 339--4 in the low/hard state were performed with Suzaku
and IRSF in 2009 March. The spectrum in the 0.5--300 keV band is dominated by
thermal Comptonization of multicolor disk photons, with a small contribution
from a direct disk component, indicating that the inner disk is almost fully
covered by hot corona with an electron temperature of $\approx$175 keV. The
Comptonizing corona has at least two optical depths, $\tau \approx 1,0.4$.
Analysis of the iron-K line profile yields an inner disk radius of
$(13.3^{+6.4}_{-6.0}) R_{\rm g}$ ($R_{\rm g} $ represents the gravitational
radius $GM/c^2$), with the best-fit inclination angle of $\approx50^\circ$.
This radius is consistent with that estimated from the continuum fit by
assuming the conservation of photon numbers in Comptonization. Our results
suggest that the standard disk of GX 339--4 is likely truncated before reaching
the innermost stable circular orbit (for a non rotating black hole) in the
low/hard state at $\sim$1% of the Eddington luminosity. The one-day averaged
near-infrared light curves are found to be correlated with hard X-ray flux with
$F_{\rm Ks} \propto F_{\rm X}^{0.45}$. The flatter near infrared $\nu F_{\nu}$
spectrum than the radio one suggests that the optically thin synchrotron
radiation from the compact jets dominates the near-infrared flux. Based on a
simple analysis, we estimate the magnetic field and size of the jet base to be
$5\times10^4$ G and $6\times 10^8$ cm, respectively. The synchrotron self
Compton component is estimated to be approximately 0.4% of the total X-ray
flux.
