In this paper we analyze productivity in Japanese information service industry We calculate OSS market value to which few paid attention before specifically. Through this calculation we analyze the contribution of OSS to this industry. Although our study has methodological problem in calculation of OSS market Value, OSS's economic effects are mostly positive for labor productivity in this industry. Therefore our study can lead to result that Japanese information service industry can increase its own productivity level through connection between "inner" resources and "outer" ones.