A certain amount of basic map data is installed into the map data storage medium in the navigation apparatus at the time of initial setting or the like, and thereafter the user connect to the map data providing center to download necessary data according to need. The data is graphically encoded to generate an image that is displayed by the first device. The terminal portion is inserted into the connector mounting portion through the slit. The cell switch delay may be determined or configured by the network dependent upon the source and target pilots in the active set are within the same BTS or are in different cells. The base section includes a first shrunk-width portion disposed on an opposite side to the side on which the support arm projects taking the center of the base section as a boundary, and within a range of the distance, and having a length in the X-axis direction gradually decreasing with a distance from the support arm in a plan view. Optimum use is made of a plurality of virus scanners by inspecting content passed over the network to identify which of the scanners is most suitable for that content.