The invention is applicable to the parking management field and provides an information processing method and a system. The method comprises steps of obtaining vehicle information of a vehicle to be parked, obtaining a parking space group corresponding to the vehicle information of the vehicle to be parked and unoccupied parking space information of the parking space group according to the vehicle information of the vehicle to be parked, wherein the unoccupied parking space information is determined according to the number of the sharing parking spaces and the number of the occupied parking spaces, and the parking mode comprises a parking space group parking mode, other parking modes or the parking prohibition , and transmitting an entrance limitation device start-up control information in order to control the start-up of the entrance limitation device and allow the vehicle to be parked to park when the parking mode is determined to be the parking space group parking mode or other parking modes. By implementing the invention, the vehicle can be allowed to park when an unoccupied parking space exists in the parking space group. As a result, the parking space resource can be effective used.