To prevent the hitting position ink drop from being shifted when a dot is generated by first and second drive pulses for two pixels adjacent in the main scanning direction.

A piezoelectric element in a print head is driven by a drive signal which can include two drive pulses selectively in one recording period. When two pixels continuous in the main scanning direction are generated dot by dot, a drive signal A including a first pulse in the first period and a second pulse in the second period or a drive signal B including a second pulse in the second period and a first pulse in the first period is employed for control Distances S3, S13 between hitting positions of both ink drops are equalized by adjusting the ejection speed Vm1 of small ink drop corresponding to the first pulse, the ejection speed Vm2 of large ink drop corresponding to the second pulse, and the ejection time difference between the first and second pulses for the drive signals A, B depending on the platen gap.