Abstract: The present invention provides an installation system that facilitates the operation on computer terminals in the network system and allows for automatic installation of an operating system software program on computer terminals. A PC to be shipped is connected to a network. After the PC is switched on, an installation floppy disk is inserted in the drive and started up. The installation start-up program stored in the floppy disk is copied to the internal memory of the PC. After the PC is connected to an installation server, the hard disk drive is initialized. The bar coded ID of the PC is read with a bar code reader. The installation information relevant to that ID is retrieved from the installation server by using the ID as a key.