  In this paper, we study the anisotropy of cosmic acceleration by dividing the
Union2 Type Ia supernova dataset into 12 subsets according to their positions
in Galactic coordinate system. In each region, we derive the deceleration
parameter $q_0$ as the diagnostic to quantify the anisotropy level in the
corresponding direction, and construct $q_0$ anisotropic maps by combining
these $q_0$ values. In addition to the monopole component, we find the
significant dipole effect in the $q_0$-maps with the amplitude
$A_1=0.466^{+0.255}_{-0.205}$, which deviates from zero at more than 2-$\sigma$
level. The direction of the best-fit dipole is ($\theta=108.8^{\circ}$,
$\phi=187.0^{\circ}$) in Galactic system. Interesting enough, we find the
direction of this dipole is nearly perpendicular to the CMB kinematic dipole,
and the angle between them is $95.7^{\circ}$. The perpendicular relation is
anomalous at the 1-in-10 level.
