Terms are extracted from service description documents describing desired services, and the terms are used to search for candidate service providers operable to provide the desired services. In the system and the method, a word to be used for drawing a patent map is extracted by calculating weight values of significant words which are gotten by removing unnecessary words from patent data, and this extracted word is matched with a patent to draw the patent map. The urging mechanism urges the lens barrier with a compression spring. The length of the reciprocating path is dynamically adjusted during the exercise operation without equipment adjustments by changes in the length of the stride input by the user at a pair of foot engagement pads disposed on laterally spaced apart foot support members. The system further comprises a data store and a timer, and stores look-up requests received from the gateway in the data store, and decides that a message is likely to be unsolicited if a corresponding look-up request has not been received within a pre-set time period.