Abstract: Provided is an intelligent automatic building control system in which a BAS and an FMS are integrated, and a facility management method by the intelligent automatic building control system. In particular, the automatic building control system integrates: a BAS unit that monitors an environmental condition at a predetermined location in a building, and controls and monitors an operation of a specific facility that supplies cooling/heating to the location in order to improve the environmental condition; and an FMS unit that maintains information input in relation to the facility, checks a fuel consumption of the facility, and monitors a real-time price of fuel supplied to the facility.