A method for displaying information in a device (1), which information is stored as a document with interpreting instructions for displaying the information. The interpreting instructions are interpreted, and on the basis of the interpretation, the information is converted to information to be displayed on the display of the device. In connection with the conversion of the document, it is examined if the document can be displayed without optimization on the display (2) of the device, wherein if, on the basis of the examination, it is detected that the displaying of the document requires optimization, the document is optimized; in other cases, the document is displayed in unoptimized format. The invention also relates to a system and a device (1) applying the method.