The present invention relates to a kind of method of phonebook system and phone directory, it can determine that the word of search failure as business category title, can instruct the title of operator's registering telephone numbers class of service. The system of the invention of telephone directory book include: search failure word detection unit which search for which detect from input telephone directory history but for it search be always fail; Relative commercial classification determines the word with the search failure detected in the keyword of business class keyword; Sighting device is specified in business class, the word of the search failure detected is provided to operator and is registered in the business category keyword of the determination with telephone number, and whether specified search terms as what is detected fail in business class using business; The classification keyword that the word of which register search failure of the word business category designating unit to fail with search specifies request from operator, and the business of telephone number is requested to make telephone number corresponding to new business registration as new category keywords according to business category. According to the present invention, search hit ratio improves registration, as business category title, word is which searches for always failure and wherein search word and new business or an occupational category of the business category relative to the search word, and the registered business category title of registering telephone numbers, according to the request from operator. ;The 2016 of copyright KIPO submissions
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