Patent ID: 8813159

Claim:
A data transmission device that transmits a plurality of contents to a data reception device, comprising: a setting information holding unit that holds setting information indicating each of the plurality of contents as a main content or a stand-by content, at least two or more contents among the plurality of contents being set as the main contents and a remaining content other than the main contents among the plurality of contents being set as a stand-by content, wherein at least one main content of the two or more main contents is set as a broadcasting content and a remaining main content other than the broadcasting content among the two or more main contents is set as a switching content, and each of the two or more main contents is managed as the broadcasting content or the switching content; a content selection unit that categorizes each of the plurality of contents into the main content or the stand-by content on a basis of the setting information held at the setting information holding unit; a main content transmission unit that transmits a content determined as the main content by the content selection unit via a high-quality line to the data reception device; and a stand-by content transmission unit that transmits a content determined as the stand-by content by the contents selection unit via a line of a quality lower than the high-quality line to the data reception device, wherein the data transmission device is placed at a broadcast spot and the data reception device is placed at a broadcasting station; a main content selection information reception unit that receives, from a data transmission control device, main content selection information including an instruction to interchange a specific stand-by content and the switching content; and a setting information update unit that updates the setting information held at the setting information holding unit on a basis of the main content selection information received by the main content selection information reception unit so that any one of the switching content is set as the stand-by content and the specific stand-by content is set as the switching content, wherein the setting information update unit decides the switching content to be interchanged with the specific stand-by content on a basis of a predetermined condition, wherein the setting information update unit manages history of contents interchanging, and excludes a switching content that was a broadcasting content immediately before from an interchanging target with the specific stand-by target, and wherein the setting information update unit refers to a lock setting condition set beforehand and excludes a specific main content that is locked by the lock setting condition from an interchanging target with the specific stand-by content.