Provided is a host computer, a driving skill determining system, a driving skill determining method, and a driving skill determination program that allow enhanced accuracy of a criterion for a driving skill. The host computer includes a determination result database configured to store a plurality of driving skill determination results, and a skill criterion generating unit configured to generate a criterion for a driving skill based on the driving skill determination results stored in the determination result database. The determination result database stores a plurality of driving skill determination results. The skill criterion generating unit generates another new criterion based on the driving skill determination results stored in the determination result database.
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