1. A remote instruction system comprising: a controller that controls an image capturing portion to capture an image of a target and transmit a captured image to a remote terminal, and controls a projecting portion to project an annotation image onto the target according to an instruction on the captured image given by the remote terminal; and a relative position changing portion that is controlled by the instruction on the captured image given by the remote terminal and changes the position of the target relative to the image projection portion and the image capturing portion.