  Based on a symmetry argument we systematically reveal Hartree-Fock
broken-symmetry solutions of the one-dimensional two-band extended
Peierls-Hubbard model, which covers various materials of interest such as
halogen-bridged metal complexes and mixed-stack charge-transfer salts. We find
out all the regular-density-wave solutions with an ordering vector $q=0$ or
$q=\pi$. Changing band filling as well as electron-electron and electron-phonon
interactions, we numerically inquire further into the ground-state phase
diagram and the physical property of each state. The possibility of novel
density-wave states appearing is argued.
