A system is provided for hiding a data group in a wireless communication device, in which a predetermined data group is hidden according to a hiding request. The system for hiding a data group comprises an encryption module for receiving the hiding request and the predetermined groups in a memory in the wireless communication device and an access module. Next, the encryption module establishes mechanism for hiding a data group to hide the predetermined data group. The access module performs the mechanism for hiding a data group and decrypts a secret code encrypted by the encryption module when data in the predetermined data group is to be read.