An apparatus and method is provided for characterizing adhesive bonding using an acoustic wave MEMS sensor. A ratio of tensile stress at 10% elongation of a rubber composition forming the adhesion rubber layer to that of a rubber composition forming the backing rubber layer is 1. A checker 30 may be coupled to the connector 10. The color peak corresponding to the background color of the document is then determined, according to predetermined rules that take into consideration the statistical information and region of influence determination.