A printer having a direct-printing function for reading and printing data stored in a storing unit, the printer including a connecting device, a user storage that stores user information including information of users permitted to print using the direct-printing function, a reading unit that reads identification information from data stored in the storing unit, a determining unit that determines whether the identification information corresponds to the user information, a direct-printing controlling unit that permits printing of the data using the direct-printing function if the determining unit determines that the identification information corresponds to the user information and prohibits printing of the data using the direct-printing function if the determining unit determines that the identification information does not correspond to the user information, and a print-executing unit executing printing if the direct-printing controlling unit permits printing of the data using the direct-printing function.