The present invention relates to a method of processing of data, which makes it possible to determine at least one device for supplying oxygen adapted to a processing of oxygen prescribed at a given patient on the basis of data entered or selected by a user. In this process, a user selects or grasps the data, such as the type of patient has to follow the treatment of oxygen, the daily duration of the patient is ambulant, at the desired flow rate of oxygen, the patient's breathing rate, and type of a condition affecting the patient. These data are stored and then put into correlation with a list stored of devices for supplying oxygen, so as to determine, from this correlation, at least one device for supplying oxygen, in the list of devices for supplying oxygen stored, which is compatible with the data entered or selected. Then, it displays or displays the said device for supplying oxygen determined.
