A broadcast receiving method comprises storing first control information in a storage device, the first control information containing information unique to a receiver and required for the receiver to select broadcasted and encrypted contents information, and receiving second control information with a receiver via a bi-directional communications channel, the second control information being for updating at least some contents of the first control information, updating the first control information in the storage device on the basis of the second control information, receiving broadcasted key information independent from the receiver and required to decrypt the contents information, and selecting and decrypting the encrypted contents information based on the key information and updated first control information.