The purpose of this study is to describe a systematic management approach for TOC(Total Ownership Cost). TOC includes all costs associated with the research, development, procurement, operation, and disposal of an individual weapon system over its life cycle. Lately, MND(Ministry of National Defense) has pushed ahead with an aggressive effort to introduce a system called TLCSM(Total Life Cycle System Management) to achieve effective performance and optimum readiness while reducing the TOC. TLCSM, as defined in US DOD policy, is the implementation, management, and oversight by the designated Program Manager, of all activities associated with the acquisition, development, production, fielding, sustainment, and disposal of a DOD weapon system across its life cycle. TOC is a core and strategic factor of TLCSM. On this study, we approach an optimized management of TOC to efficiently execute and reduce limited budget. A final goal of TOC Management is to reduce a life cycle cost and maximize capabilities that represent system readiness, availability, and logistics supportability. The proposed management method will be useful to introduce and apply successful TLCSM.