An inkjet printer having a platen to which a suction unit is disposed suppresses increasing the time required for printing to end and suppresses unnecessary operation of the suction fan. The inkjet printer 1 receives control data from a host computer 3, and starts operation of the suction fan 26f if a printing-related command instructing rendering image data to be printed by the inkjet head 10 in the image buffer BF is included in the received control data.