To perform easy-to-use speech recognition processings for users.

When nonverbal speech is inputted from a speech signal acquiring means, according to the questiom to the user, the effectiveness of inputting the nonverbal speech is decided according to the state when the nonverbal speech is inputted, thereby deciding that either one among the confirmation of a work content, the sospension of the work content or the execution of the work content is performed, according to the decided result of the effectiveness.