The prior arts have a problem that it is not precisely determined whether or not a human entering a room is an intruder, and consequently raising an alarm when there is a slightest possibility of an intruder, a malfunction may result, and raising an alarm only when there is a strong possibility of an intruder, a response to an intruder actually entered the room may be delayed. A self-propelled cleaner according to this invention is capable of executing a phased security, that is, turning on lights, flashing lights, making a loud sound, generating a go-away message, and generating a police report message upon detection of a human suspected of being an intruder, and takes an image of the room at each stage to transmit the resulting image to a family member away from the home, and determines whether or not the security level should be escalated according to an instruction from the family member