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We have proposed a distributed storage system based on self-encryption scheme for the purpose of protecting private information stored in mobile handsets. We define self- encryption scheme as an encryption scheme whose encryption key is generated from the information contained in the target file itself. In our proposed system, the information is split into two pieces and one of them is stored in a local storage of a mobile handset and the other is uploaded to a network storage, and they are encrypted respectively. In this paper, we construct a user-based private storage system with the authentication and the secure path that IMS provides. To relax the load of mobile handsets, not the mobile handset but the network server encrypts an uploaded plaintext file into s distributed data using self-encryption scheme. Sharing a storage infrastructure based on P2P overlay network with other users, the intruder cannot get all the distributed data only by hacking a single server. Moreover, if the data for uploading is already stored by other user, physical upload procedure is omitted, thus reducing the uploading time. IMS providing index application server, a supernode P2P net work storage provides efficient look-up with fault-resilience and high scalability.