A chapter creating device (11, 12) adapted to create chapter data which indicates a reproduction point of a broadcast content including at least one of screen image and sound, the chapter creating device comprising: a live data receiving unit that receives a plurality of live data including character string data which is input to a terminal by a person who views and/or listens to the broadcast content and is transmitted from the terminal to the live data receiving unit and receives a data registration date and time which is a date and time when the character string data is received to be stored in a live data storage unit which stores the live data therein; a broadcast content information storage unit that stores a combination of a broadcasting time of a plurality of broadcast contents which are broadcasted by broadcasting stations and broadcast content information which is sub-information about each broadcast content; a chapter candidate selecting unit (140, 140A) that displays the plurality of live data received by the live data receiving unit on a display unit, and acquires a selected live data from a selection by a user among the plurality of live data using an input unit; and a chapter creating unit that creates the chapter data comprising the character string data of the selected live data as a header, the data registration date and time of the selected live data as a time information, and a broadcasting station ID identifying said broadcasting station which broadcasts said broadcast content, and wherein the chapter creating device (11, 12) further includes: a broadcasting station identifying unit that acquires for each broadcasting station the broadcast content information for which the broadcasting time includes the data registration date and time of selected live data and determines the broadcasting station ID based on the highest degree of association calculated between the character string data of said selected live data and each of the acquired broadcast content information. a live data receiving unit that receives a plurality of live data including character string data which is input to a terminal by a person who views and/or listens to the broadcast content and is transmitted from the terminal to the live data receiving unit and receives a data registration date and time which is a date and time when the character string data is received to be stored in a live data storage unit which stores the live data therein; a broadcast content information storage unit that stores a combination of a broadcasting time of a plurality of broadcast contents which are broadcasted by broadcasting stations and broadcast content information which is sub-information about each broadcast content; a chapter candidate selecting unit (140, 140A) that displays the plurality of live data received by the live data receiving unit on a display unit, and acquires a selected live data from a selection by a user among the plurality of live data using an input unit; and a chapter creating unit that creates the chapter data comprising the character string data of the selected live data as a header, the data registration date and time of the selected live data as a time information, and a broadcasting station ID identifying said broadcasting station which broadcasts said broadcast content, and wherein the chapter creating device (11, 12) further includes: a broadcasting station identifying unit that acquires for each broadcasting station the broadcast content information for which the broadcasting time includes the data registration date and time of selected live data and determines the broadcasting station ID based on the highest degree of association calculated between the character string data of said selected live data and each of the acquired broadcast content information. a broadcasting station identifying unit that acquires for each broadcasting station the broadcast content information for which the broadcasting time includes the data registration date and time of selected live data and determines the broadcasting station ID based on the highest degree of association calculated between the character string data of said selected live data and each of the acquired broadcast content information.