A display device, a management device, a management system, and a control program for switching between an operability emphasis mode where a light touch operation is possible and a high noise resistance mode dynamically depending on an ambient noise state are provided. A display device including a capacitive touch screen includes: a transmitting unit that transmits change amount data of an electrostatic capacitance detected by the touch panel to a management device; and a setting unit that receives an operation mode determined by the management device according to the change amount data and sets a threshold for identifying presence of a touch corresponding to the operation mode to the touch panel.