PROBLEM TO BE SOLVED: To provide an agricultural system aiming at improvement of yield and quality of agricultural products. SOLUTION: The agricultural system has reference image information P11 to P13 in which crops in the growing process are imaged in advance by an unmanned aerial vehicle, and reference history information P22 including a history of agricultural work performed on the crop by the unmanned aerial vehicle. The first degree of association w13 to w22 of three or more stages of the combination having ~ P25 and the next agricultural work to be performed by the unmanned aerial vehicle for the combination is acquired in advance. After that, the difference between the image information obtained by capturing the field of the agricultural product to be newly farmed by the unmanned aerial vehicle and the reference image information P11 to P13 of the first degree of association, and the history of the farming work of the unmanned aerial vehicle that carried out the farming work. Based on the third degree of association acquired from the second reference history information P22 to P24, the optimum agricultural work A to E is searched for. [Selection diagram] FIG.
