PURPOSE: To control and clean indoor environments for meeting room or the like and hence obtain more comfortable environment.

CONSTITUTION: There are installed indoors a sensor 9 which detects odor, such as cigarette smoke and a deodorant or a perfume-contained spray 11. This indoor purification system controls the spray 11 based on the detection results of the sensor 9 and disperse the deodorant or the like indoors, thereby inhibiting odor from spreading indoors. Since deodorants or perfumes are sprayed so as to eliminate indoor odor, it is, therefore, possible to purify the indoor environment and create more comfortable living environment and eliminate the discomfort of an occupant more effectively.