An object of the invention is to provide a liquid droplet ejecting apparatus capable of determining a type of droplet to be ejected through each nozzle at an arbitrary ejection timing, with consideration of not only an influence of droplet ejections at preceding and following ejection timings, but also crosstalk between a nozzle column and another nozzle column.A data generation circuit of the liquid droplet ejecting apparatus includes a first storage unit, a second storage unit, and a droplet type determination unit. The first storage unit stores therein information on a plurality of types of droplets. The second storage unit stores therein time-sequence information of a type of droplet which information associates each ejection timing of each nozzle with one of the types of droplets. The droplet type determination unit determines a type of droplet to be associated with an arbitrary ejection timing of each nozzle, with reference to an ejection plan of the nozzle included in the time-sequence information, and a type of droplet associated with the arbitrary ejection timing of another nozzle.