A system of autonomous work machines comprising a plurality of autonomous work machines working in the same area, a network and a server, wherein an autonomous work machine that includes a camera (11,11R,11L) configured to capture an image of an external world, the autonomous work machine comprising: a communication unit configured to be capable of wireless communication with the server via the network; an obtainment unit configured to obtain, based on date and time information, azimuth information of the sun, and imaging date and time information of the autonomous work machine, sun information that indicates one of a position and an azimuth of the sun in which backlighting can occur while the autonomous work machine is traveling in a work area; a generation unit configured to generate, as the sun information in a case in which a track (305,801,1120,1121,1122) in which backlighting will occur is present among the set tracks (301,302,303,304,305, 801,802, 1110, 1120, 1111, 1121, 1112, 1122, 1113) while the autonomous work machine is traveling in the work area, information obtained by associating the azimuth information of the sun with the imaging date and time information and position information and direction information on the track (301,302,303,304,305, 801,802, 1110, 1120, 1111, 1121, 1112, 1122, 1113) of the autonomous work machine; and a control unit configured to set, based on the sun information generated by the generation unit, tracks (1010,1012,1110,1111,1112,1113,1120,1121,1122) by which the autonomous work machine will avoid backlighting, characterized by the communication unit causes a database in the server to store the sun information generated by the generation unit, the obtainment unit obtains the sun information stored in the database, and the sun information stored in the database is shared among the plurality of autonomous work machines that are working in the same work area. a communication unit configured to be capable of wireless communication with the server via the network; an obtainment unit configured to obtain, based on date and time information, azimuth information of the sun, and imaging date and time information of the autonomous work machine, sun information that indicates one of a position and an azimuth of the sun in which backlighting can occur while the autonomous work machine is traveling in a work area; a generation unit configured to generate, as the sun information in a case in which a track (305,801,1120,1121,1122) in which backlighting will occur is present among the set tracks (301,302,303,304,305, 801,802, 1110, 1120, 1111, 1121, 1112, 1122, 1113) while the autonomous work machine is traveling in the work area, information obtained by associating the azimuth information of the sun with the imaging date and time information and position information and direction information on the track (301,302,303,304,305, 801,802, 1110, 1120, 1111, 1121, 1112, 1122, 1113) of the autonomous work machine; and a control unit configured to set, based on the sun information generated by the generation unit, tracks (1010,1012,1110,1111,1112,1113,1120,1121,1122) by which the autonomous work machine will avoid backlighting, the communication unit causes a database in the server to store the sun information generated by the generation unit, the obtainment unit obtains the sun information stored in the database, and the sun information stored in the database is shared among the plurality of autonomous work machines that are working in the same work area.