Provided is a system and the like that can improve operability of a manipulation mechanism for an operator. Manipulation reaction forces f1(θ) and f2(ϕ) acting on manipulation levers 2111 and 2112 are controlled by controlling operation of actuators 214. At this time, the manipulation reaction forces f1(θ) and f2(ϕ) are controlled to cause reaction forces F1(θ) and F2(ϕ) in manipulation directions opposite to each other perceived by the operator through manipulation levers 2111 and 2112 (manipulation mechanism) to realize symmetry about a manipulation amount of zero, within a manipulation amount range in a positive manipulation direction and a manipulation amount range in a negative manipulation direction.