  Effects of supersymmetric particles on flavor changing neutral current and
lepton flavor violating processes are studied in the supersymmetric SU(5) grand
unified theory with right-handed neutrino supermultiplets. Using input
parameters motivated by neutrino oscillation, it is shown that the
time-dependent CP asymmetry of radiative B decay can be as large as 30% when
the $\tau \to \mu \gamma$ branching ratio becomes close to the present
experimental upper bound. We also show that the $B_s$--$\bar{B}_s$ mixing can
be significantly different from the presently allowed range in the standard
model.
