The invention relates to a method of identifying a language in which a text is composed in the form of a string of characters, and also to a method of controlling a speech reproduction unit and to a communication device. A molding material is disposed under the first package component and molded to the first and the second package components, wherein the molding material and the first package component form an interface. After that, in the step obtained is the random probability of failure ) which is a probability that the number of faulty chips included in the randomly-extracted chips should be not less than the equivalent of the number of faulty chips with defect.