To provide a portable information reading processor which can select a specific information from read information and can display the scale of the whole image according to the selected information.

This portable information reading processor 1 has a console panel 5 and a pen 6 for inputting specific instructions, a camera 3, and a display pane 4 which displays an image picked up by the camera 3. The console panel 5 and pen 6 are operated to select and recognize character information 7 on the display screen 40 of the display panel 4. According to the recognized character data, the size of the character information is determined and a scale 9 is displayed on the display screen 40.