A display apparatus management system having at least one display apparatus with a display part to display an image, a memory to allow data to be stored and/or removes, and a display controller to control a display state of the image displayed on the display part; at least one client connected with each display apparatus and to output an image signal to the display apparatus; and a host having an input part to allow input of a display identification to each display apparatus, a database registered with the display identification of each display apparatus inputted via the input part and a client identification of each client, and a host controller to transfer the display identification to the display apparatus through the client to enable the display controller to store the display identification to the memory. The display apparatus management system, thus, identifies and/or manages the display apparatus connected with each client from the host. Further, by adding the lock function to the display apparatus, the present invention provides protection against a theft.