System for purifying indoor atmosphere

An indoor air cleaning system is provided to perform a variable air purification process according to environmental change of the installation space, and maintain amenity of indoor air by selectively using a control algorithm that is suitable for environmental conditions within the installation space. An indoor air cleaning system(100) comprises: a sensor drive part(110) comprising one or more sensors selected from a dust sensor(111), a carbon dioxide sensor(112), a carbon monoxide sensor(113), a volatile organic compound sensor(114), a temperature/humidity sensor(115), an ion sensor(116), and an ozone sensor(117) respectively having first connecting ports(119); a plurality of first signal ports(120) to which the first connecting ports are detachably connected; an external apparatus(130) comprising one or more equipments selected from a purification filter(131), an ionizer(132), a ventilation fan(133), and an ozonizer(134) respectively having second connecting ports(135); a plurality of second signal ports(140) to which the second connecting ports are detachably connected; an external server(150) for storing a plurality of different control algorithms that are drive control signals of the respective equipments according to sensing information of the respective sensors; a transmission port(160) which is connected to the external server with or without a wire, and receives any one control algorithm selected from a plurality of control algorithms of the external server; an operating part(170) for selecting a control algorithm desired by a user during connection of the external server using the transmission port; a control part(180) for transmitting the equipment control signals to the second signal ports by generating equipment control signals of the respective equipments corresponding to the sensing information of the respective sensors received through the first signal ports; and a display part(190) for displaying the sensing information of the respective sensors and operating states of the respective equipments in the form of letters or graphics, and displaying a plurality of control algorithm information stored in the external server.