Vacuum cleaner system and dangerous position posting method

A dangerous position posting method in a vacuum cleaner system including a vacuum cleaner that performs cleaning while autonomously running and a display unit that displays information acquired from the vacuum cleaner, the method comprising:

• causing an object information acquisition unit to acquire object information from the vacuum cleaner, the object information being information on an object present around the vacuum cleaner;
• causing a danger determination unit to determine danger of the object based on the acquired object information;
• causing a map acquisition unit to acquire a map of an area where the vacuum cleaner runs;
• and
• causing a dangerous position display unit to cause a display unit to display the danger of the object determined by the danger determination unit and the acquired position of the object on the map in association with each other.