An agricultural field management system includes a plurality of communication devices arranged on an agricultural field, each of the communication devices including an outputting circuit being configured to output identification information, a signal receiving circuit disposed on a management machine movable in an agricultural field and configured to receive the identification information outputted by the outputting circuit a position detecting circuit disposed on the management machine and configured to detect measurement information based on a signal from a navigation satellite, a first obtaining circuit to obtain the identification information received by the signal receiving circuit, a second obtaining circuit to obtain the measurement information detected by the position detecting circuit of the management machine on the agricultural field, a relating circuit to relate the identification information obtained by the first obtaining circuit to the measurement information obtained by the second obtaining circuit.
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