A scanning method used to scan documents in a scanning system, the system including a scanner and a user host computer having a technology without an interesting name (TWAIN) driver, the scanner and the user host computer connected by a local interface and a network, includes selecting one of the local interface or the network to connect the scanner and the user host computer; if the network is selected, connecting the TWAIN driver to the scanner via the selected network to control scanning processes of the scanner; and performing scanning according to the selected local interface or the network.