1. A remote instruction system comprising: a plurality of recording and projecting apparatuses that collectively handle a handled region of a target, the handled region of the target being divided into a plurality of sub-regions and each of the plurality of recording and projecting apparatuses handling a sub-region among the plurality of sub-regions and comprising a video recorder that records the sub-region and a projector that projects an annotation image onto the sub-region, wherein a field angle of the video recorder corresponds to a field angle of the projector; a wide area video recorder that records a wide area covering an entirety of the handled region; and a controller that, for each of the plurality of recording and projecting apparatuses, calibrates a projection position of the annotation image with respect to the sub-region before projecting based on a conversion parameter and controls the projector to project the calibrated annotation image, the conversion parameter being a parameter to convert position coordinates of the sub-region handled by the recording and projecting apparatus and those of the wide area recorded by the wide area video recorder, and projects the calibrated annotation image using the converted position coordinates onto the target.