According to one embodiment, an image forming apparatus includes a printer configured to form an image on a sheet at a carrying speed, a first reading/writing unit configured read tag information stored in a wireless tag disposed on the sheet and to write tag information to the wireless tag, a reading/writing control unit configured to control the first reading/writing unit to read tag information stored in the wireless tag and to write tag information to the wireless tag, and a printer control unit configured to control the carrying speed of the sheet according to a total number of wireless tags disposed on the sheet.