Abstract: An operation information management method includes detecting, for each user, access frequency corresponding to farming use information that represents an index of work performed in a field by a working device. In addition, the operation information management method includes deciding, for each user, a sampling interval to obtain operation information that indicates an operating state of the working device in accordance with the access frequency. In some implementations, deciding the sampling interval for each user may include deciding a position of the access frequency of a corresponding user in a distribution of the access frequency and deciding the sampling interval on the basis of the position of the access frequency.

Abstract: A management terminal, which manages one of a tractor, a rice transplanter, and a combine harvester, as a plurality of types of work machines that perform a plurality of types of work, respectively, on a field, is provided with a storage portion which stores a management application for managing the plurality of types of work machines, a control device which activates the management application, and a display portion. When the control device activates the management application, the control device displays, on the display portion, a plurality of app activation icons corresponding to the plurality of types of work machines, respectively, in such a way that the plurality of app activation icons are selectively operable. Also, the control device activates, in response to selective operation of any one of the plurality of app activation icons, an individual application for operating the work machine corresponding to the selectively operated app activation icon.