A host computer transmits a plurality of print data pieces to which an identical password is added to a printing apparatus. The printing apparatus includes a unit configured to receive and store one of the transmitted plurality of print data pieces, an operation unit configured to accept input of a password from a user, an image formation unit configured to perform, when the password input from the user and the password added to the stored print data match each other, image formation based on the print data to which the identical password to the input password is added, and a control unit configured to cause, when it receives the remaining one of the transmitted plurality of print data pieces after the image formation has been performed, the image formation unit to perform the image formation based on the remaining print data without making the user input the password again.