光合成細菌などの巨大な分子を非経験的に取り扱うのは非常に困難であり，分子力学等の古典的な方法論によってその電荷を解析する必要がある．電荷平衡法は分子中の原子の部分電荷を簡便に計算できる方法である．その電荷の計算には原子数と同じ次元の連立一次方程式を解く必要がある．原子数が数万になる場合，1台のワークステーションでの計算は不可能となる．そこで，本稿では分散並列処理によって電荷の計算を効率良く行う事を試みた．It is almost impossible to treat the huge molecules as photosysthetic bacteria by ab initio molecular orbital theory, then we need to treat the molecules by the molecular mechanic method, which is a classical methodology. The charge equilibration method is convenient method to calculate the partial charges in the molecule. In order to calculate the charges, we need to solve the linear equation whose order is the same as the number of atoms in the molecule. The case which the number of atoms becomes large (縲鰀20000) it is difficult to solve the linear equation on the computer with single CPU. In this report, we try to efficiently calculate the partial charges of the atoms in Rhodpseudmonas viridis by parallel computing.