  We propose a unified model to explain Quasi-Periodic-Oscillation (QPO),
particularly of high frequency, observed from black hole and neutron star
systems globally. We consider accreting systems to be damped harmonic
oscillators exhibiting epicyclic oscillations with higher order nonlinear
resonance to explain QPO. The resonance is expected to be driven by the
disturbance from the compact object at its spin frequency. The model explains
various properties parallelly for both types of the compact object. It
describes QPOs successfully for ten different compact sources. Based on it, we
predict the spin frequency of the neutron star Sco X-1 and specific angular
momentum of black holes GRO J1655-40, XTE J1550-564, H1743-322, GRS 1915+105.
