Abstract: An embedded device (10) for processing man-machine interface (MMI) operations includes a firmware module (20) and a description module (30). The firmware module is for implementing all functions of the embedded device, and includes an MMI kernel (200) for receiving and processing operation commands and displaying corresponding pictures. The MMI kernel includes a reading module (210), a storage module (220) connected to the reading module, and a drawing module (230) connected to the storage module. The description module is connected to the MMI kernel, and is used for saving description data of the pictures displayed by the MMI kernel. The reading module is for reading the description data saved in the description module. The storage module is for saving the description data read by the reading module. The drawing module is for searching description data corresponding to the operation commands and creating pictures according to the searched description data.