To provide a print system wherein security of storage print data is improved.

When storing print data, a printer driver of a host PC 2 connected to a network generates a list of an HDD allowing access by user authority of the host PC 2 performing a print instruction to an image forming device 1 connected to the network, i.e., a mount table, and transmits the mount table to the image forming device 1 together with the print instruction. The image forming device 1 accesses a PC on the network on the basis of the mount table transmitted by the printer driver of the host PC 2, and mounts the HDD of each the PC. The image forming device 1 performs an access check when performing the mount, and performs the mount before a time-out. The print data are stored in the mounted HDD, the mount is detached after the storage is completed, and a signal notifying the stored HDD of the PC is transmitted to the host PC 2.