Fuente: Wipo "Sensorization" A travel distance calculation device is configured to: add a first distance between a first main sensor and a hub sensor to a travel distance when a person is detected by the hub sensor provided in a third space connecting a first space and a second space after the person is detected by the first main sensor provided in the first space; add a second distance between a second main sensor and the hub sensor to the travel distance when the person is detected by the hub sensor after the person is detected by the second main sensor provided in the second space; and add no third distance between the first main sensor and the second main sensor to the travel distance when the person is detected by the second main sensor after the person is detected by the first main sensor.