A dust removing apparatus is provided. An air blower performs air blowing in a space. A processor determines a first period in which a user is absent in the space. An air sucker collects dust by performing air suction from the space during the first period. A sensor measures an amount of dust collected by performing the air suction in the space during the first period. The processor determines whether or not a usage status of the dust removing apparatus in the space is appropriate based on a comparison between the measured amount of dust collected in the first period and an estimated amount of dust, which is estimated to be collected under a usage condition in which the user is absent in the space, and outputs information indicating whether or not a usage status of the dust removing apparatus is appropriate based on a result of the comparison.