Projector and image generating method thereof

A projector for projecting an image is disclosed. The projector includes a memory device containing a plurality of memory blocks for storing a plurality of image data respectively corresponding to different image sources; an integrating module coupled to the memory device for selectively reading the plurality of image data from the memory device, and for integrating at least two image data read from the memory device into an image data stored in the memory device corresponding to the image; and a projecting module for projecting the image.