  A new Monte Carlo scheme based on the system of Tsallis's generalized
statistical mechanics is applied to a simple double well potential to calculate
the canonical thermal average of potential energy. Although we observed serious
quasi-ergodicity when using the standard Metropolis Monte Carlo algorithm, this
problem is largely reduced by the use of the new Monte Carlo algorithm.
Therefore the ergodicity is guaranteed even for short Monte Carlo steps if we
use this new canonical Monte Carlo scheme.
