An agricultural field management system includes a plurality of communication devices arranged on an agricultural field, each of the communication devices including: an output part for outputting identification information, a signal receiving part located on a management machine that can be moved in the agricultural field and configured to receive the identification information output from the output part, a position detection part located on the management machine and configured to detect measurement information based on a signal from a navigation satellite, a first extraction part for obtaining the identification information, received by the signal reception part, a second extraction part for obtaining the measurement information of the management machine on the agricultural field, a reference manufacturing part to He establishing a reference of the identification information obtained by the first extraction part to the measurement information obtained by the second extraction part.
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