The livestock information management system (100) has image data of a predetermined area (A) to which livestock (501, 502, 503 ... 525) with identification information (T1, T2, T3 ... T25) can move. Based on the image data of the imaging unit (10 and the predetermined area (A)), the identification information (T1, T2, T3 ... T25) of the livestock (501, 502, 503 ... 525) is obtained. The identification information acquisition unit 22 to be acquired, the position information acquisition unit (23) for acquiring the respective position information of the livestock (501, 502, 503 ... 525) based on the image data of the predetermined area A, and the livestock (23). Each of 501, 502, 503 ... 525) is provided with an information storage unit (25) that stores identification information (T1, T2, T3 ... T25) and position information in association with each other.家畜情報管理システム(100)は、識別情報(T1,T2,T3・・・T25)が付された家畜(501,502,503・・・525)が移動可能な所定領域(A)の画像データを取得する撮像部(10と、所定領域(A)の画像データに基づいて、家畜(501,502,503・・・525)のそれぞれの識別情報(T1,T2,T3・・・T25)を取得する識別情報取得部22と、所定領域Aの画像データに基づいて、家畜(501,502,503・・・525)のそれぞれの位置情報を取得する位置情報取得部(23)と、家畜(501,502,503・・・525)のそれぞれごとに、識別情報(T1,T2,T3・・・T25)と位置情報とを関連付けて記憶する情報記憶部(25)と、を備える。