| http://www.w3.org/ns/prov#value | - Referring to FIG. 4, the voice guidance device includes a user information acquisition unit 301 for acquiring user information, such as a user ID, and for determining which user is operating the voice guidance device; a trouble detection unit 302 for detecting trouble in an apparatus and acquiring trouble information about the type of trouble; a trouble history database 306 for storing trouble his
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