Warning method and warning system

A warning system that issues a warning relating to any one of poor physical health, illness, or injury of a monitored person, the warning system comprising:

• an information acquisition unit configured to acquire at least one of biological information pertaining to the monitored person and environment information pertaining to surroundings of the monitored person;
• a risk degree calculation unit configured to calculate a degree of risk relating to the at least one poor physical health, illness, or injury of the monitored person based on the information acquired by the information acquisition unit;
• a warning-issuing means that issues the warning based on an extent of the degree of risk calculated by the risk degree calculation unit;
• a position information acquisition unit configured to acquire position information pertaining to a plurality of monitored persons;
• and
• a surrounding-person count calculation unit configured to calculate a surrounding-person count corresponding to the monitored persons who are present in the surroundings of each of the monitored persons based on the position information acquired by the position information acquisition unit,
• the warning-issuing means changing a scope of the warning according to the extent of the degree of risk, and
• the risk degree calculation unit setting a threshold value pertaining to the scope of the warning to a lower value as the surrounding-person count decreases.