A printing apparatus, printing method and storage medium therefor for executing a plurality of trial printings. The apparatus includes a printing unit, a setting unit to set a printing condition, an inputting unit to input image data, first and second controlling units, and first and second accepting units. The first controlling unit controls the printing unit to execute first trial printing according to the inputted image data and the set printing condition. The first accepting unit accepts a changing instruction for changing the printing condition. The second accepting unit accepts an execution instruction for executing a second trial printing, and the second controlling unit controls the printing unit to execute the second trial printing according to the inputted image data and the changed printing condition. In a case where the first accepting unit does not accept the changing instruction, the second accepting unit cannot accept the executing instruction.