The printing device receives the printing data for confidential printing, and determines an output destination of the printing data received for confidential printing to be either a lockable output bin or a digital output bin. The lockable output bin can be locked and unlocked by a key and the print data can be output to the lockable output bin in a form of being printed on recording medium. The digital output bin holds the printing data and allows the printing data being held therein to be read out for printing when a user is verified. When the lockable output bin is assigned as the output destination and the lockable output bin of the printing device that received the printing data is in an unusable state, another printing device having a lockable output bin that can be used is searched and the printing data is transferred to the other printing device.