A watching support system ensures that a person in charge of watching can be efficiently and effectively arranged in a watching system capable of detecting a position of an object person with high power efficiency and accuracy. An object person terminal transmits identification information via short-range wireless communication. A detection terminal is carried by a person in charge of watching who detects and performs watching over an object person, and transmits the identification information transmitted from the object person terminal that can be communicated to a server. The server specifies the position of the object person terminal based on information transmitted from a detection terminal, acquires watching need information regarding a necessity of watching by the person in charge of watching, and outputs an instruction regarding watching to the detection terminal based on the watching need information.