The present invention relates to an image recording apparatus, an image recording method, and an image compressing apparatus capable of performing a still image process during moving image shooting without stopping a sequence of a moving image process also in the case of performing the still image shooting during the moving image shooting. In a moving image shooting mode, CCD data of an odd-numbered frame image and image data of an even-numbered frame image are separately stored into an SDRAM. In the case of writing CCD data of an odd-numbered frame image, in parallel with the writing, a moving image process based on CCD data of an even-numbered frame image written in the immediately preceding cycle is performed. When shooting still images is directed during the moving image, the still image process is divided into processes for a plurality of cycles and then executed.