Provided is an installation guide system for an air conditioner. The installation guide system may include a display that displays a user interface for designing an installation for an air conditioner, a memory that stores at least one image for a building in which the air conditioner is installed, and a controller to control a display of the stored images on the user interface. The user interface may include a first region that displays the stored image including a plurality of tubes that connect an indoor unit to an outdoor unit of the air conditioner, and a second region that displays information regarding an interference between at least two of the plurality of tubes.