A display apparatus, a display system having the same, and a method for setting an ID thereof are provided. The method for setting an ID of a display system including a plurality of display apparatuses includes: determining, by a first display apparatus from among the plurality of display apparatuses, whether a second display apparatus from among the plurality of display apparatuses is connected thereto; in response to determining that the second display apparatus is connected thereto, determining, by the first display apparatus, an ID of the second display apparatus based on a set ID of the first display apparatus; and transmitting, from the first display apparatus to the second display apparatus, an ID setting command including the determined ID of the second display apparatus.