Method for monitoring and controlling the unwinding of a thread from a reel and for supplying said thread to a textile machine by means of a supply device, said supply device comprising: - an electronic control unit; - a thread collection and supply unit configured to assist the winding of the thread taken from the reel, said thread collection and supply unit being moved by an electric motor driven by the electronic control unit; - first sensor means associated with the thread collection and supply unit and electrically connected to the electronic control unit, said first sensor means being configured to detect a first piece of data indicative of a current torque applied to the thread collection and supply unit; - second sensor means electrically connected to the electronic control unit, said second sensor means being configured to detect a second piece of data indicative of a current tension value of the thread supplied to the textile machine, the method comprising the following steps continuously carried out during an operation time interval of the supply device: - providing the electronic control unit with said first piece of data and said second piece of data; - calculating, by the electronic control unit, a first numeric indicator representative of the torque values applied to the electric motor to move the thread collection and supply unit, each variation of the first numeric indicator in said operation time interval being representative of a variation of the torque value applied to the motor to compensate for a deviation of the first piece of data detected from a first pre-set torque reference value (dlref); - calculating, by the electronic control unit, a second numeric indicator representative of tension values applied to the thread supplied to the textile machine, each variation of the second numeric indicator in said operation time interval being representative of a deviation of the second piece of data detected from a second pre-set reference value (d2ref) of the tension of the thread supplied to the textile machine; - detecting, based on an analysis of said first and second numeric indicator performed by the electronic control unit, malfunctions in the unwinding of the thread from the reel and in the supply of the thread to the textile machine; - signaling, by the electronic control unit, the occurrence of said malfunctions, wherein said step of detecting malfunctions comprises a step of detecting a first type and a second type of malfunctions, said step of signaling the occurrence of said malfunctions comprises a step of providing a first type and a second type of signaling. - an electronic control unit; - a thread collection and supply unit configured to assist the winding of the thread taken from the reel, said thread collection and supply unit being moved by an electric motor driven by the electronic control unit; - first sensor means associated with the thread collection and supply unit and electrically connected to the electronic control unit, said first sensor means being configured to detect a first piece of data indicative of a current torque applied to the thread collection and supply unit; - second sensor means electrically connected to the electronic control unit, said second sensor means being configured to detect a second piece of data indicative of a current tension value of the thread supplied to the textile machine, the method comprising the following steps continuously carried out during an operation time interval of the supply device: - providing the electronic control unit with said first piece of data and said second piece of data; - calculating, by the electronic control unit, a first numeric indicator representative of the torque values applied to the electric motor to move the thread collection and supply unit, each variation of the first numeric indicator in said operation time interval being representative of a variation of the torque value applied to the motor to compensate for a deviation of the first piece of data detected from a first pre-set torque reference value (dlref); - calculating, by the electronic control unit, a second numeric indicator representative of tension values applied to the thread supplied to the textile machine, each variation of the second numeric indicator in said operation time interval being representative of a deviation of the second piece of data detected from a second pre-set reference value (d2ref) of the tension of the thread supplied to the textile machine; - detecting, based on an analysis of said first and second numeric indicator performed by the electronic control unit, malfunctions in the unwinding of the thread from the reel and in the supply of the thread to the textile machine; - signaling, by the electronic control unit, the occurrence of said malfunctions,