Abstract: Operating system for managing public parking lot which provides a solution for controlling public parking lots, by using for telecommunications technology which, in combination with mobile devices, allows interconnection of sales terminals with a supervisory program in order to make the process electronic and automated. A reception module receives information about the vehicle, an electronic coupon issuing module generates the electronic coupon based on the provided information and payment, which data is stored in together, and an activation and deactivation module enables activation and deactivation of each electronic coupon upon entry of the number of the electronic coupon and the password of that electronic coupon. The activation and deactivation module provides a confirmation of activation or deactivation of the electronic coupon to a telephone number associated with the electronic coupon.