A mixed reality presenting apparatus for merging an incident real-space image and a generated virtual-space image comprises a measuring section which measures the orientation of a unit for entering the real-space image and the speed or acceleration thereof; a virtual-space image generating section which generates virtual-space image data on the basis of the measurement result; a correcting optical system which corrects the path of light passing therethrough; and a correcting optical system control section which controls the correcting optical system on the basis of the measured speed or acceleration.