A projector adapted to correct a keystone distortion of an image, includes a frame memory adapted to store a pre-correction image, a block data storage memory adapted to store the pre-correction image by block data that composed of M pixels in a first direction and N pixels in a second direction (M, N≧2), a correction section adapted to correct the pre-correction image based on the block data stored in the block data storage memory, and a control section adapted to perform control of obtaining the pre-correction image from the frame memory by the block data, and storing the obtained pre-correction image in the block data storage memory, and the control section obtains contiguous n×N (n≧2) lines of the image from the frame memory and stores the obtained image in the block data storage memory at the beginning of the correction process.