  I summarize the results of barely model-dependent phenomenological analyses
of the structure of the neutrino flavor mixing. The analyses are based on the
three-flavor mixing framework without sterile neutrinos and utilize the hints
from solar and atmospheric neutrino observations as well as that from mixed
dark matter cosmology. It will be demonstrated that the features of the
analysis is sharply distinguished by the two cases (I) with and (II) without
dark matter mass scale, and by whether one (or two) mass is dominant (OMD) or
the three states are almost degenerate (ADN). The global features of the
neutrino mixing is illuminated for these different mass patterns.
