  The absorption and emission spectra for the minimally-coupled brane and bulk
scalar fields are numerically computed when the spacetime is a $5d$ rotating
black hole carrying the two different angular momentum parameters $a$ and $b$.
The effect of the superradiant scattering in the spectra is carefully examined.
It is shown that the low-energy limit of the total absorption cross section
always equal to the area of the non-spherically symmetric horizon, {\it i.e.}
$4\pi (r_H^2 + a^2)$ for the brane scalar and $2\pi^2 (r_H^2 + a^2) (r_H^2 +
b^2)/r_H$ for the bulk scalar where $r_H$ is an horizon radius. The energy
amplification for the bulk scalar is roughly order of $10^{-9} %$ while that
for the brane scalar is order of unity. This indicates that the effect of the
superradiance is negligible for the case of the bulk scalar. Thus the standard
claim that {\it black holes radiate mainly on the brane} is not changed
although the effect of the superradiance is taken into account. The physical
implication of this fac t is discussed in the context of TeV-scale gravity.
