Abstract: A liquid ejection head ejects liquid droplets toward a target medium while being moved in a first direction. A temperature detector detects temperature in a peripheral region of the liquid ejection head. A signal generator generates a first signal including first pulses operable to drive the liquid ejection head so as to eject the liquid droplets toward a unit region in the target medium at a first frequency, and a second signal including second pulses operable to drive the liquid ejection head so as to eject the liquid droplets toward the unit region at a second frequency which is lower than the first frequency.