  We study the possible impact of the neutrino oscillation which could be
induced by a tiny violation of equivalence principle (VEP) for neutrinos
emitted from supernova driven by gravitational collapse. Due to the absence of
any significant indication of neutrino oscillation in the SN1987A data, we
obtain sever bounds on relevant VEP parameters \delta \gamma\lsim O(10^{-31})
for massless or degenerated neutrinos and \delta \gamma \lsim O(10^{-16})\times
[\Delta m^2/10^{-5} eV^2] for massive neutrinos.
