Control method for work vehicle, work vehicle control program, work vehicle control system, and work system

A work vehicle control system that is used for a work vehicle that performs work while self-traveling in a work site along a target route, the work vehicle control system comprising:

• a generation processing unit that generates the target route, wherein
• the generation processing unit is configured to be able to designate a travel direction of the work vehicle at an end point of a circulating route when generating the circulating route on which the work vehicle travels to circulate around an outer peripheral region of the work site in the target route.