A point-of-sale terminal comprising: a mounting means comprising a guide panel, by which a mobile terminal, such as a tablet personal computer or a smart phone, is mounted on the mounting means, a fixing cover, coupling protrusions formed on the rear portion of the mounting means and an insert recess; wherein the guide panel is open in an upper portion of the mounting means, is integrally connected to both side edges and the lower edge of the mounting means and abuts the outer circumference of the mobile terminal and wherein the fixing cover closes the open upper portion of the guide panel, which prevents the mobile terminal from being lost or stolen; a docking station having a front portion and a rear portion and comprising a connector, coupling recesses, by which the mounting means is separably coupled to the front portion of the docking station whereby the coupling protrusions of the mounting means are fitted into the coupling recesses of the docking station and whereby the connector is inserted in the insert recess of the mounting means, a power connection, by which power is supplied to the mobile terminal, and a connecting recess to which a display section is connected and which is provided in the rear portion of the docking station, wherein an inside of the docking station is configured such that the docking station interworks with the mobile terminal via wires or wirelessly so that payment processing is performed; and the display section which is separably connected to the docking station wherein the display section displays a receipt that is issued when the payment processing is performed via the mobile terminal, outputs various types of advertisement, and acts as a signature pad on which a person who pays is to sign. a mounting means comprising a guide panel, by which a mobile terminal, such as a tablet personal computer or a smart phone, is mounted on the mounting means, a fixing cover, coupling protrusions formed on the rear portion of the mounting means and an insert recess; wherein the guide panel is open in an upper portion of the mounting means, is integrally connected to both side edges and the lower edge of the mounting means and abuts the outer circumference of the mobile terminal and wherein the fixing cover closes the open upper portion of the guide panel, which prevents the mobile terminal from being lost or stolen; a docking station having a front portion and a rear portion and comprising a connector, coupling recesses, by which the mounting means is separably coupled to the front portion of the docking station whereby the coupling protrusions of the mounting means are fitted into the coupling recesses of the docking station and whereby the connector is inserted in the insert recess of the mounting means, a power connection, by which power is supplied to the mobile terminal, and a connecting recess to which a display section is connected and which is provided in the rear portion of the docking station, wherein an inside of the docking station is configured such that the docking station interworks with the mobile terminal via wires or wirelessly so that payment processing is performed; and the display section which is separably connected to the docking station wherein the display section displays a receipt that is issued when the payment processing is performed via the mobile terminal, outputs various types of advertisement, and acts as a signature pad on which a person who pays is to sign.