The invention relates to a method for controlling a hearing aid (1a, 1b) using a control unit (7), which is linked to the hearing aid (1a, 1b). The latter receives acoustic signals via a microphone (2a, 2b), amplifies said signals and outputs them by means of a loudspeaker (3a, 3b). In said hearing aid (1a, 1b) digital signals are processed according to a predetermined algorithm and data concerning the acoustic environment is created and forwarded to a control unit (7) via a communication interface (6a, 6b). To improve the quality and ease of operation, the data in the control unit (7) is analysed and an optimal algorithm is calculated, which is transmitted to the hearing aid (1a, 1b) via the communication interface (9).