An information retrieval system for retrieving information relating to a locality includes a data collecting module for collecting data relating to a location of the device and the locality in which the device is located. A difference between an area of one chip occupied by the protective film of the monitor chip region and an area of one chip occupied by the protective film of the device chip region is 20% or less. Particularly, SiC, GaN, AlN, Si and Diamond materials are given as examples.