Abstract: A method for inputting and outputting data for a communication device in a vehicle includes receiving an abstract input or output method AMx for inputting data into and outputting data out of a communication application arrangement APP from a communication application arrangement APP of the communication device, selecting at least one physical I/O unit PHEx depending on at least one type of a requested abstract I/O method AMx, an addressed HMI endpoint user HEx, a vehicle state VSx, a driving state DSx and/or en environmental condition ECx, and outputting data of the abstract I/O method AMx through the selected physical I/O unit PHEx and/or receiving input data of the physical I/O unit PHE, and converting the input data into an abstract input method AMix for inputting the abstract input method AMix into the communication application means APP. A human machine interface unit and a communication device including the human machine interface unit for performing the I/O method are also disclosed.