An illuminating device includes an illuminating component set, a controlling circuit coupled to the illuminating component set, and a communication circuit electrically coupled to the controlling circuit. The controlling circuit further includes a storage and a processor electrically connected to the storage. The communication circuit is configured for receiving a picture transmitted by an input device and storing the picture into the storage. The processor selectively drives the illuminating component set to emit light according to a controlling signal and the picture. The illuminating device can be configured on a wearable object, so that the wearable object can be controlled to emit light by the input device.