A system, comprising: a conveyer unit comprising a conveyance path along which a to-be-conveyed object on which a thermoreversible recording medium is affixed is conveyed in a predetermined conveyance direction; a laser rewriting apparatus positioned on one side or the other side of the conveyance path, the laser rewriting apparatus emitting laser light to the thermoreversible recording medium and rewriting an image, the laser rewriting apparatus comprising: an image erasing apparatus that emits laser light to the thermoreversible recording medium on which the image is recorded and erases the image; and an image recording apparatus that is positioned on a downstream side in the predetermined conveyance direction of the image erasing apparatus and records a new image by emitting laser light to the thermoreversible recording medium from which the image has been erased by the image erasing apparatus, wherein the image erasing apparatus and the image recording apparatus have respective laser light emitting parts (15a, 17a) for emitting the laser light which are provided at the upstream ends of the sides of both the image erasing apparatus and the image recording apparatus which face the conveyance path with regard to the conveyance direction or at a downstream end of the sides of the both image erasing apparatus and the image recording apparatus which face the conveyance path with regard to the conveyance direction, characterized in that a length of the image erasing apparatus along the predetermined conveyance direction is different from a length of the image recording apparatus along the predetermined conveyance direction, and a distance between a center of the image recording apparatus and a center of the laser light emitting part of the image recording apparatus along the predetermined conveyance direction is equal to a distance between a center of the image erasing apparatus and a center of the laser light emitting part of the image erasing apparatus along the predetermined conveyance direction. a conveyer unit comprising a conveyance path along which a to-be-conveyed object on which a thermoreversible recording medium is affixed is conveyed in a predetermined conveyance direction; a laser rewriting apparatus positioned on one side or the other side of the conveyance path, the laser rewriting apparatus emitting laser light to the thermoreversible recording medium and rewriting an image, the laser rewriting apparatus comprising: an image erasing apparatus that emits laser light to the thermoreversible recording medium on which the image is recorded and erases the image; and an image recording apparatus that is positioned on a downstream side in the predetermined conveyance direction of the image erasing apparatus and records a new image by emitting laser light to the thermoreversible recording medium from which the image has been erased by the image erasing apparatus, wherein an image erasing apparatus that emits laser light to the thermoreversible recording medium on which the image is recorded and erases the image; and an image recording apparatus that is positioned on a downstream side in the predetermined conveyance direction of the image erasing apparatus and records a new image by emitting laser light to the thermoreversible recording medium from which the image has been erased by the image erasing apparatus, wherein the image erasing apparatus and the image recording apparatus have respective laser light emitting parts (15a, 17a) for emitting the laser light which are provided at the upstream ends of the sides of both the image erasing apparatus and the image recording apparatus which face the conveyance path with regard to the conveyance direction or at a downstream end of the sides of the both image erasing apparatus and the image recording apparatus which face the conveyance path with regard to the conveyance direction, characterized in that a length of the image erasing apparatus along the predetermined conveyance direction is different from a length of the image recording apparatus along the predetermined conveyance direction, and a distance between a center of the image recording apparatus and a center of the laser light emitting part of the image recording apparatus along the predetermined conveyance direction is equal to a distance between a center of the image erasing apparatus and a center of the laser light emitting part of the image erasing apparatus along the predetermined conveyance direction.