Absorption and scattering of visible light by a cluster of nano-sized metal particles is numerically considered in connection with localized surface plasmons. The numerical technique employed here is based on the Generalized Multipole Technique (GMT) in which the fields inside and outside the particles are expanded in spherical vector wave functions. We first confirm the dipolar plasmon resonance in a nano-sized gold particle: the expansion coefficients of the lst-order spherical mode exhibit the characteristic of resonance when localized surface plasmons are excited on the nanoparticles. Next, we investigate the interaction between the surface plasmon modes on the nano-particles. It is well-know, that is, n that the interaction has large influence on the scattering and absorption of light by a cluster of nano-sized metal particles.%複数個のナノ金属粒子による光の散乱閉居をGMTにより数値解析し，ナノ金属粒子に励起する局在プラズモンについて調べた．その結果は，これまで報告されていることであるが，下記の事を確認した：（1）局在プラズモンが励起するところで多重極展開のn=1次のモードが共振している；
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