To provide an ink jet imaging apparatus and an ink jet imaging method in which a dot of a desired size can be formed at all gradations while suppressing blur of ink at the time of multi-drop system imaging.

For a multi-drop system imaging apparatus, a maximum ejection number altering means 82 is provided to set a smaller maximum ejection number of ink drops constituting one ink dot as a recording sheet having a lower permeability of ink is employed. Furthermore, a speed alteration means 83 is provided to set a higher scanning speed of an ink jet head as the maximum ejection number of ink drops decreases.