A social information distribution device sorts, into pre-classified items, basic information that includes the positions of a plurality of information sources and social information that is chronologically issued by the plurality of information sources; accumulates the basic information and social information; analyzes the accumulated social information according to a specified purpose; corrects the social information as necessary and updates the social information as a portion of the items; selects social information to broadcast from among the accumulated social information; determines a broadcast mode for when the selected social information is broadcast that at least includes the type of broadcast area, the broadcasting time period, and the number of repetitions within the broadcasting time period; and transmits the selected social information according to the determined broadcast mode to a specified broadcast area using broadcast waves. A user terminal device locates a current position and displays the social information that is distributed from the social information distribution device so as to include the relationship between the position indicated by the social information and the located current position.