An in-vehicle information distribution system for distributing information in a train constituted by a plurality of vehicles, the in-vehicle information distribution system comprising: a plurality of image display devices (30, 30-1n, 30-2n, 30-3n) that display a plurality of image contents transmitted from a ground communication device to the train; a communication device (4, 4-1, 4-2, 4-3) that is connected to an inter-vehicle communication path and an in-vehicle communication path and that relays information; and a central device that is connected to the communication device (4, 4-1, 4-2, 4-3) and an on-vehicle communication device within a same vehicle by the in-vehicle communication path and that manages information transferred to the train, wherein the central device includes: a first information storage unit where an image-contents-distribution management table in which identification information for uniquely identifying the respective image contents and the respective image contents storage locations are stored in a corresponding manner, and the respective image contents are stored; and a first information control unit that determines one image display device (30, 30-1n, 30-2n, 30-3n) that is to store therein image contents, and distributes image contents stored in the first information storage unit to the one determined image display device (30, 30-1n, 30-2n, 30-3n), wherein each of the image display devices includes: a second information storage unit in which the image contents distributed from the first information control unit are stored; and a second information control unit that determines the location where the image contents are stored and displays the image contents read out from the determined location, wherein the first information control unit is configured to determine the one image display device (30, 30-1 n, 30-2n, 30-3n) based on the image-contents-distribution management table, characterized in that: in each of the image display devices (30, 30-1 n, 30-2n, 30-3n) the second information storage unit stores the image-contents-distribution management table distributed from the first information control unit; and in each of the image display devices (30, 30-1 n, 30-2n, 30-3n) the second information control unit determines the location where image contents are stored based on the image-contents-distribution management table. a plurality of image display devices (30, 30-1n, 30-2n, 30-3n) that display a plurality of image contents transmitted from a ground communication device to the train; a communication device (4, 4-1, 4-2, 4-3) that is connected to an inter-vehicle communication path and an in-vehicle communication path and that relays information; and a central device that is connected to the communication device (4, 4-1, 4-2, 4-3) and an on-vehicle communication device within a same vehicle by the in-vehicle communication path and that manages information transferred to the train, wherein the central device includes: a first information storage unit where an image-contents-distribution management table in which identification information for uniquely identifying the respective image contents and the respective image contents storage locations are stored in a corresponding manner, and the respective image contents are stored; and a first information control unit that determines one image display device (30, 30-1n, 30-2n, 30-3n) that is to store therein image contents, and distributes image contents stored in the first information storage unit to the one determined image display device (30, 30-1n, 30-2n, 30-3n), wherein each of the image display devices includes: a second information storage unit in which the image contents distributed from the first information control unit are stored; and a second information control unit that determines the location where the image contents are stored and displays the image contents read out from the determined location, a first information storage unit where an image-contents-distribution management table in which identification information for uniquely identifying the respective image contents and the respective image contents storage locations are stored in a corresponding manner, and the respective image contents are stored; and a first information control unit that determines one image display device (30, 30-1n, 30-2n, 30-3n) that is to store therein image contents, and distributes image contents stored in the first information storage unit to the one determined image display device (30, 30-1n, 30-2n, 30-3n), wherein each of the image display devices includes: a second information storage unit in which the image contents distributed from the first information control unit are stored; and a second information control unit that determines the location where the image contents are stored and displays the image contents read out from the determined location, a second information storage unit in which the image contents distributed from the first information control unit are stored; and a second information control unit that determines the location where the image contents are stored and displays the image contents read out from the determined location, in each of the image display devices (30, 30-1 n, 30-2n, 30-3n) the second information storage unit stores the image-contents-distribution management table distributed from the first information control unit; and in each of the image display devices (30, 30-1 n, 30-2n, 30-3n) the second information control unit determines the location where image contents are stored based on the image-contents-distribution management table.