A parking lot information service system and method provide position information of an available parking space in a parking lot. The system includes an electronic device that outputs parking lot information in a vehicle that is waiting to park in a parking lot associated with a multi-use facility. The system further includes a facility server that manages facility usage information of a user corresponding to a parked vehicle in the parking lot. The system also includes a parking lot server that predicts departure time of the parked vehicle by analyzing the facility usage information and generates the parking lot information based on the predicted departure time.