A distributed data server is a portable data server that is built by incorporating it with an embedded system. The distributed data server can receive outside data through an input unit, process the outside data via a control unit and then store the processed data to a storage unit. The server provides a network unit for the outside world to inquire about the processed data via the Internet. The server further offers a display unit to show a data message that is outputted from the control unit. In addition, the control unit can determine whether a plurality of states of data being written onto the storage unit are abnormal and, if so, output an abnormal signal as a warning. Hence, the distributed data server can reduce the huge systematic structure of the known distributed data server and construct any type of monitoring system flexibly.