A method for authenticating capacitive touch that is executed through a system interworking with a capacitive touch screen that supports multi-touch, the method comprising: a first step of storing one or more designed geometric relationships for arranging a plurality of touch portions on a touch device that is to be touched in a capacitive touch screen; a second step of receiving touch point information about a plurality of touch points recognized as multi-touch through the capacitive touch screen; a third step of reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a specified position in design among the plurality of touch portions arranged in the one or more designed geometric relationships on the touch device, wherein the one or more designed geometric relationships include both a distance relationship and an angular relationship between center points of the respective touch portions or both a distance relationship and an angular relationship between a coordinate origin identified using the specified touch point and each touch point; a fourth step of coordinate-rotating the plurality of touch points or a geometric relationship for the plurality of touch points to match one of the one or more designed geometric relationships based on a reference point corresponding to the specified touch point; and a fifth step of authenticating whether the coordinate-rotated geometric relationship matches one of the one or more stored designed geometric relationships within a tolerance range or identifying a geometric relationship among the one or more stored designed geometric relationships matching the coordinate-rotated geometric relationship within a tolerance range, wherein the angular relationship includes a coordinate angle in a coordinate system, the coordinate angle including at least one of an angle formed by segments connecting the respective touch points, an angle formed by segments connecting the coordinate origin and the respective touch points, an angle formed by segments connecting the respective touch points based on the specified touch point, and an angle formed by segments connecting the specified touch point and the respective touch points based on a specific baseline in the coordinate system, and wherein the fifth step includes authenticating whether a maximum spacing distance among distances between the respective touch points is smaller than a maximum spacing distance set in design. a first step of storing one or more designed geometric relationships for arranging a plurality of touch portions on a touch device that is to be touched in a capacitive touch screen; a second step of receiving touch point information about a plurality of touch points recognized as multi-touch through the capacitive touch screen; a third step of reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a specified position in design among the plurality of touch portions arranged in the one or more designed geometric relationships on the touch device, wherein the one or more designed geometric relationships include both a distance relationship and an angular relationship between center points of the respective touch portions or both a distance relationship and an angular relationship between a coordinate origin identified using the specified touch point and each touch point; a fourth step of coordinate-rotating the plurality of touch points or a geometric relationship for the plurality of touch points to match one of the one or more designed geometric relationships based on a reference point corresponding to the specified touch point; and a fifth step of authenticating whether the coordinate-rotated geometric relationship matches one of the one or more stored designed geometric relationships within a tolerance range or identifying a geometric relationship among the one or more stored designed geometric relationships matching the coordinate-rotated geometric relationship within a tolerance range, wherein the angular relationship includes a coordinate angle in a coordinate system, the coordinate angle including at least one of an angle formed by segments connecting the respective touch points, an angle formed by segments connecting the coordinate origin and the respective touch points, an angle formed by segments connecting the respective touch points based on the specified touch point, and an angle formed by segments connecting the specified touch point and the respective touch points based on a specific baseline in the coordinate system, and wherein the fifth step includes authenticating whether a maximum spacing distance among distances between the respective touch points is smaller than a maximum spacing distance set in design.