  We have studied low-lying metastable states of the $\pm J$ Heisenberg model
in two ($d=2$) and three ($d=3$) dimensions having developed a hybrid genetic
algorithm. We have found a strong evidence of the occurrence of the Parisi
states in $d=3$ but not in $d=2$. That is, in $L^d$ lattices, there exist
metastable states with a finite excitation energy of $\Delta E \sim O(J)$ for
$L \to \infty$, and energy barriers $\Delta W$ between the ground state and
those metastable states are $\Delta W \sim O(JL^{\theta})$ with $\theta > 0$ in
$d=3$ but with $\theta < 0$ in $d=2$. We have also found droplet-like
excitations, suggesting a mixed scenario of the replica-symmetry-breaking
picture and the droplet picture recently speculated in the Ising SG model.
