An information processing method of an information processor includes: obtaining information received from a mobile body through a wireless communication, the mobile body including a movement mechanism and an imaging unit configured to capture image data, the information received from the mobile body including captured image data obtained by the imaging unit, with the captured image data being updated periodically; and generating route guidance information for use in moving the mobile body by the movement mechanism. The captured image data is stored together with data update time information. The route guidance information includes at least two selectable routes. The route guidance information is generated based on the captured image data, position information of the mobile body, and the data update time information.