  We propose an off-axis relativistic jet model for the Type Ic supernova SN
2007gr. Most of the energy ($\sim2\times10^{51}$ erg) in the explosion is
contained in non-relativistic ejecta which produces the supernova. The optical
emission is coming from the decay process of $\rm ^{56}Ni$ synthesized in the
bulk SN ejecta. Only very little energy ($\sim10^{48}$ erg) is contained in the
relativistic jet with initial velocity about 0.94 times the speed of light. The
radio and X-ray emission comes from this relativistic jet. With some typical
parameters of a Wolf-Rayet star (progenitor of Type Ic SN), i.e., the mass loss
rate $\dot{M}=1.0 \times10^{-5} M_{\odot} \rm yr^{-1}$ and the wind velocity
$v_{\rm w}=1.5\times10^{3} \rm km s^{-1}$ together with an observing angle of
$\theta_{\rm obs} = 63.3^{\circ}$, we can obtain the multiband light curves
that fit the observations well. All the observed data are consistent with our
model. Thus we conclude that SN 2007gr contains a weak relativistic jet and we
are observing the jet from off-axis.
