| 摘要 |
PROBLEM TO BE SOLVED: To more easily determine the validity of position identification information transmitted from a terminal.SOLUTION: An information distribution system includes: an information distribution device; an acoustic wave generator for outputting an acoustic wave including first identification information; and a terminal for transmitting an information distribution request. The information distribution device includes: a determination part for, when a distance between the position of the acoustic wave generator identified from the first identification information included in a first information distribution request received at a first time and the position of the acoustic wave generator identified from the first identification information included in a second information distribution request received at a second time prior to the first time is equal to or less than a threshold, determining that second identification information included in the first information distribution request is the valid first identification information; and a distribution control part for, when the first identification information is valid, distributing distribution information associated with the first identification information to the terminal which has transmitted the information distribution request.SELECTED DRAWING: Figure 1 |
