In recent years, many accounting scandals have been reported in companies not only in the United States, but also in Japan. The need for Internal Control is growing steadily. In particular, auditing logs is important for Internal Control. Internal Control lacking audit is incomplete. In addition, logs are included not only defensive implication but also a lot of information to lead to improve company. And thus the precise make use of the log can be beneficial in a company. However, the cost of an information system is dependent on the amount of data, which in the case of log data can be very large. Today, there is not a little the case that is not used software though they purchased it in the organizations such as a company or the school. When a license is not used definitely, it is a waste cost. We have overcome the capacity problem by developing the Virtual Large-Scale Disk (VLSD) toolkit, which allows us to construct large-scale disks. Using this toolkit, we have implemented log storage with low cost and a long lifetime. In this paper, by using this system with a database, we suggest a method to manage confirming whether a license is used effectively giving the using rate of the software from logs.
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