A point-of-sale (POS) terminal and a POS system, by which the cost spent for the establishment of the POS system is reduced. Ordering, payment and management of sales information can be conducted irrespective of location, thereby maximizing user convenience. The general functions of a POS terminal, such as barcode scanning, near-field communication (NFC), signing, and the like, can be performed based on a variety of functions of a mobile terminal in order to provide an optimum solution in any sales environment.