An image forming device for printing print data received from a terminal device through a communication network; the image forming device including an acquiring unit, a storing unit, a determining unit, and a print control unit. The acquiring unit acquires terminal identification information of the terminal device from the terminal device to install a printer driver. The acquired terminal identification information is stored in the storing unit. When the print data is received and determination is made by the determining unit that the terminal identification information contained in the received print data does not match the terminal identification information stored in the storing unit, the print control unit accepts a print instruction from a user and executes printing of the received print data according to the print instruction.