Abstract: A handheld electronic device including a data input module, a database and a display unit is provided. The data input module includes an image fetching unit and a pattern recognition unit. The image fetching unit is for fetching a pattern of an external object to produce image data. The pattern recognition unit is for transferring the image data to input data. The database is for storing several storage data items. Each storage data item has subject information. When the input data is related to one of the storage data items, the display unit is for displaying navigation information generated according to the subject information of the related storage data item.

Abstract: A data backup method is applicable to a cell phone with a data to be backed up stored therein. In the method, a timing instruction is first received to calculate a predetermined time period. Then, it is determined uninterruptedly whether the predetermined time period has elapsed. When the predetermined time period has elapsed, the data to be backed up is stored in a storage device.