  A simple mechanism to generate Dirac masses for the neutrinos in SU(5)
supersymmetric grand unified theory is proposed. The tiny Dirac masses are
induced by the small mixing between the Higgs fields and another superheavy
fields. The mixing terms are obtained by the same mechanism as the mu-term
generation of the order of the supersymmetry breaking scale, so that the mixing
of order TeV / M_GUT \sim 10^{-13} is realized. We consider the lepton flavor
violating processes in this model. The branching ratios are directly related to
the neutrino oscillation parameters and we can predict the B(\tau -> \mu
\gamma) / B(\mu -> e \gamma) ratio once the neutrino oscillation parameters are
determined.
