Provided are an installation guide system for an air conditioner and a method of using the same. The installation guide system for an air conditioner may include a memory that stores at least one image for a building in which an air conditioner installed, and a display providing a user interface to design a disposition of the air conditioner in the building. The user interface may include a first region that provides a recommended configuration of indoor units to be installed based on a type of an indoor unit of the air conditioner or load information for a prescribed room in which the indoor unit is installed. The user interface may also include a second region that displays the stored image of the building and a graphical image for the indoor units in the image of the building based on the recommendations provided in the first region.