System and operation method

A system, comprising:

• a main device configured to be operated by a first limb of a user, the main device being configured with at least a first contact unit and an operated component, the first contact unit
• connecting to the operated component, and
• configured to change a target position defined by the operated component within a first range, which is an operable range by a movement of the first limb of the user, in accordance with the movement of the first limb of the user by contacting the operated component with the first limb, the first limb being located at one of a right side and a left side of the user, wherein the operated component is directly displaced by the movement of the first limb of the user such that a displacement of the first limb continuously and proportionally corresponds to a displacement of the operated component;
• a sensor unit configured to measure an error from a predetermined trajectory of the target position with respect to an actual trajectory due to the movement of the first limb;
• a second contact unit
• including an error sense presentation unit, and
• configured to contact a second limb of the user, the second limb being located at the other of the right side and the left side of the user;
• and
• a position adjustment unit configured to
• displace the operated component within a second range that is smaller than the first range, and
• adjust a position of the operated component so as to correct the error without perceptibly altering a tactile sensation experienced by the first limb of the user when the error is within the second range, wherein
• the error sense presentation unit is configured to present the error to the user by imparting a force sensation or a tactile sensation, which is generated based on the error, to the second limb.