A user terminal is provided, including a communication interface unit which receives an application content at least part of which is encrypted, a storage unit which stores the received application content, a decryption unit which decrypts the application content, a user interface unit which receives a command to execute the application content, and a controlling unit which controls the decryption unit to install an application content stored in the storage unit in an encrypted state and decrypt the installed application content according to the execution command. Accordingly, an application, which is an executable content, may be downloaded and installed in a user terminal, and used and updated safely.