A projection video display device includes: a projection unit projecting a display video upon a projection surface; an image capture unit; detection units detecting the states of manipulation objects which carry out actions for the input manipulation; a manipulation instruction information generating unit, on the basis of the states of the manipulation objects which the detection units have detected, generating manipulation instruction information indicating a description of the input manipulation; and a communication unit connecting to the information processing device. The detection units detect movements of manipulation objects and attributes which represent the states of manipulation objects other than the movements. The manipulation instruction information generating unit generates, first control information for carrying out the pointer manipulation input upon the information processing device, and, on the basis of the attributes of the manipulation objects, second control information for carrying out a prescribed key input upon the information processing device.