Abstract: An aroma diffusing system according to an example embodiment includes an aroma diffusing device and a mobile device. The aroma diffusing device includes a wireless communication module. The aroma diffusing device is equipped with first through n-th aroma capsules selected among a plurality of aroma capsules, which emit respective aromatic substances having different scents from each other. The mobile device is connected to the aroma diffusing device through a wireless communication. The mobile device independently controls an intensity of the emission of the aromatic substance of each of the first through n-th aroma capsules, which are installed in the aroma diffusing device, to determine a combination of scents diffused from the aroma diffusing device. The mobile device controls the intensity of the emission of the aromatic substance of each of the first through n-th aroma capsules by digitizing the intensity to an integer value.