is transmitted to the network printer 300 a in the network printer 300 a if the print completion notice is received through steps s 202 a and s 204 a the job ticket is not frozen e g released and the number of printable copies is decremented as a result if the number of printable copies of the job ticket becomes u2018 0 u2019 through steps s 208 a and s 210 a the utilization history information is generated and the generated utilization history information is stored in the storage device 83 a while being added to the job ticket next a case in which printing is performed by the network printer 300 a will be described the user goes to the network printer 300 a and inserts the authentication card into the card reader 34 a in the network printer 300 a if the authentication card is inserted through steps s 652 a and s 654 a the authentication information is read from the authentication card by the card reader 34 a and the user authentication is performed on the basis of the read authentication information as a result if the user authentication is accomplished through steps s 660 a to s 664 a the job ticket is frozen print data is read out from the storage device 83 a and the print control is performed on the basis of read.