a database network system is capable of recognizing in a short time the state of damage or the like of city lifelines over a whole city . a database network system according to the present invention includes a center station , relay database stations , and terminal stations . a terminal station group includes a plurality of terminal stations for acquiring changing information to accumulate the information as data and for transmitting the data as requested . each of the plurality of relay database stations is arranged for the terminal station group , and accumulates pieces of information sequentially received from the terminals as specific data and other data and transmits the data as requested . the center station sequentially receives parts of the specific data and other data of an arbitrary one of the relay database stations from the corresponding relay database station , performs a receiving operation of all the data and the specific information data a plurality of times by performing the receiving operation a plurality of times , and accumulates the data as needed .