  We analyze the emission plateaus in the X-ray afterglow lightcurves of
gamma-ray bursts (GRBs) and in the optical lightcurves of Type II superpernovae
(SNe IIP) in order to study whether they have similar late energy injection
behaviors. We show that correlations of bolometric energies (or luminosities)
between the prompt explosions and the plateaus for the two phenomena are
similar. The Type II SNe are in the low energy end of the GRBs. The bolometric
energies (or luminosities) in prompt phase E_{\rm expl} (or L_{\rm expl}) and
in plateau phase E_{\rm plateau} (or L_{\rm plateau}) share relations of E_{\rm
expl} \propto E_{\rm plateau}^{0.73\pm 0.14} and L_{\rm expl} \propto L_{\rm
plateau}^{\sim 0.70}. These results may indicate a similar late energy
injection behavior to reproduce the observed plateaus of the plateaus in the
two phenomena.
