A dryer comprising: a user interface configured to receive input for a drying course; a communication interface; a drum; a hot air supply device to supply hot air to the drum; a sensing device, enabled to self-generate power based on a movement of the sensing device inside the drum while the drum is being rotated and transmits sensing data according to a voltage generated according to the self-power generation to the communication interface; and a processor to control an operation of the hot air supply device on the basis of the input for the drying course received through the user interface, where the control of the operation of the hot wind supplying device by the processor includes determining an operation time during which the hot air supply device operates to supply the hot air to the drum on the basis of the sensing data.