Abstract: An operation management method does: acquiring a work plan that mutually associates a farm field F where a work vehicle does work, work content of the work to be done by the work vehicle at the farm field F, and a scheduled work day of the work; determining whether or not a first work plan that needs to be alerted for the work vehicle to do the work as planned in the work plan is present in plural work plans that include the work plan; and notifying work information on the first work plan, when the first work plan is present in the plural work plans.