According to one embodiment, a position determination unit of a printing system determines a printing position of printing information printed on an object to be printed conveyed by a conveyance machine. An erasing unit erases the printing information printed using thermochromic ink by emitting heat from a heat source, a height position of which is adjusted according to the printing position, from a direction perpendicular to a conveyance direction according to a timing at which the printing position, determined based on the printing position, passes. A printing unit includes a printer using the thermochromic ink, disposed behind the heat source along the conveyance direction, and prints information on the object to be printed from the direction perpendicular to the conveyance direction by the printer, a height position of which is adjusted according to the printing position, according to the timing at which the printing position passes. A facing mechanism causes a printing surface of the object to be printed to face a printer head of the printer at least when the printing unit prints the information.