The projection display apparatus and a projection display method

The projection display apparatus 1 includes an image projection unit 21 for displaying by projecting an image to the image projection plane 2, the sensors 11 and 12 for detecting the operator 3 for operating the projection display device 1, the output of sensor It includes an operation detecting unit 13 for detecting a motion of an operator, a control unit 24 for controlling the image projection section 21 based on the detection result of the operation detecting unit, from. Sensing area 400 detected by the sensor 11 and 12, set as the direction of the image projection plane 2 are different as in the vertical case and horizontal, towards the case of the horizontal than when the direction of the video projection plane is vertical the narrower it is preferable. From this, regardless of the direction of the video projection plane 2, it is possible to accurately detect the operation of the user (operator).