A securing element for interposition between two components to be joined, includes a double-stick bonding substrate, and plural anchoring bodies adhesively held on the substrate and projecting toward the components. The general-purpose CPU starts counting the number of bits of the reception data in response to a detection signal from the additional circuit, the detection signal indicating the detection of the start bit. The shell portion and the interface member are generally symmetrical about a median place. Each scoring feature-specific matrix has a score field for each different combination of text passage and question term, and each score field holds a score value indicating how each different combination of text passage and question term supports the candidate answers as being a correct answer to the question.