An image processing apparatus includes a near field communication (NFC) unit that establishes, when a portable terminal device comes near the NFC unit, wireless communication with the portable terminal device; a short-range communication unit that has a larger wireless communication coverage than that of the NFC unit, establishes, after the wireless communication has been established and connection setting information has been received via the NFC unit, wireless communication with the portable terminal device by using the connection setting information; a data processing unit that performs data processing on data received via the short-range communication unit; a printer unit that prints out the processed data; and a control unit that controls, when the data received via the short-range communication unit is determined to contain data about image processing control, processing performed by the data processing unit or the printer unit in accordance with the data about image processing control.