A search device and an information providing system are structured, to lessen a user's operation load, such that a crawling portion executes a crawling while sequentially changing an expansion header indicating a voice display capacity in an HTTP request into a voice display capacity of a typical model within each of model groups, and registers the obtained result in a search index in correspondence to the model name within the model group, a search service providing portion executes a search from the search index in correspondence to a search condition like a key word from a cellular phone terminal unit and the model name in the HTTP request, and a response portion generates a search result in correspondence to a template, and sends to a Web browser of the cellular phone terminal unit via an HTTP server.