An area estimation apparatus 100 includes: a reception level receiving unit 110 configured to receive, from a plurality of the radio signal capturing terminals 40a and 40b via the network, a radio signal reception level transmitted from the radio signal transmitting terminal 10, a radio signal transmitting terminal ID for uniquely identifying the radio signal transmitting terminal 10, and a radio signal capturing terminal ID for uniquely identifying each of the plurality of radio signal capturing terminals 40a and 40b; with a presence area of the radio signal capturing terminals being known; a reception level storage unit 123 configured to store the radio signal reception level, the radio signal transmitting terminal ID and the radio signal capturing terminal ID, which are received from each of the radio signal capturing terminals 40a and 40b, in association with one another; and a presence area estimating unit 140 configured to refer to the reception level storage unit and to estimate the presence area of the radio signal transmitting terminal 10, by using at least one presence area of at least one radio signal capturing terminal 40a identified by at least one radio signal capturing terminal ID associated with a predetermined range of at least one radio signal reception level.