The watching system 1 includes a plurality of radio wave detectors 42 for individually detecting the biological information of the subject by radiating and receiving microwaves, a setting unit 4 for individually setting operating conditions of the plurality of radio wave detectors 42, . The setting unit 4 satisfies a predetermined condition in which radio wave interference and radio wave interference do not occur based on the arrangement of the plurality of radio wave detection units 42, the radiation direction of the microwaves by the radio wave detection unit 42, and the distance between the adjacent radio wave detection units 42 And derives the frequency of the microwave used by each of the plurality of radio wave detection units 42. And these frequencies are individually set in a plurality of radio wave detection sections 42.見守りシステム1はマイクロ波を放射及び受信して被検者の生体情報を個別に検出する複数の電波検出部42と、複数の電波検出部42の動作条件を個別に設定する設定部4と、を備える。設定部4は複数の電波検出部42の配置、電波検出部42によるマイクロ波の放射方向及び隣り合う電波検出部42の間の距離に基づいて電波干渉、電波混信が発生しない所定条件を満足する複数の電波検出部42各々が使用するマイクロ波の周波数を導出する。複数の電波検出部42においてそれら周波数を個別に設定する。
