To provide a digital local area broadcast system in which a content provider can alter a provided content surely and easily.

At the time of receiving frame information indicative of the description specification of a content from a content providing unit 14, a wide area station 11 performing wide area broadcasting authenticates the content providing unit 14. At the time of receiving a content from the content providing unit 14, a local area station 12 authenticates the content providing unit 14 and verifies matching of a content received from the content providing unit 14 and the description specification of the frame information. If the content matches the description specification of the frame information, local area broadcast of the content is performed at the local area station 12.