A printing apparatus includes a data reading unit that reads data from a storage device that can store pieces of data, the data reading unit being connectable to the storage device, an input panel that accepts an input a password used to decrypt encrypted data stored in the storage device, a password storing unit that stores the input password, a data decrypting unit that decrypts the encrypted data by using the stored password, a decrypted data storing unit that temporarily stores the decrypted data, and a re-decrypting unit that decrypts other encrypted data stored in the storage device by using the stored password.