  We study the quantum theory of the spherically symmetric black holes. The
theory yields the wave function inside the apparent horizon, where the role of
time and space coordinates is interchanged. The de Broglie-Bohm interpretation
is applied to the wave function and then the trajectory picture on the
minisuperspace is introduced in the quantum as well as the semi-classical
region. Around the horizon large quantum fluctuations on the trajectories of
metrics $U$ and $V$ appear in our model, where the metrics are functions of
time variable $T$ and are expressed as $ds^2=-{\alpha^2}/U dT^2 + U dR^2 + V
d\Omega^2$. On the trajectories, the classical relation $U=-V^{1/2}+2Gm$ holds,
and the event horizon U=0 corresponds to the classical apparent horizon on
$V=2Gm$. In order to investigate the quantum fluctuation near the horizon, we
study a null ray on the dBB trajectory and compare it with the one in the
classical black hole geometry.
