This paper verifies competitive conditions between private banks and Postal Savings in Japan from 1997 FY (era of the Ministry of Posts and Telecommunications) to 2008 FY (era of the post-privatization in postal services), and discusses about how to cover financial universal service cost (USC) in Postal Savings. Firstly, we estimate the values of administrative privileges conferred to Postal Savings such as tax remissions, and compare them with the costs of administrative restrictions imposed on it such as financial universal service obligation for which we also have to estimate. Next, we consider about the balance of the financial privileges given to Postal Savings (e.g. governmental guarantees of principals and interests of deposits) and financial restrictions on it (e.g. depositing limit per person). And lastly, based on all results, we discuss about means to cover the USC.