To provide a transmitter for transmitting content via a predetermined channel in a digital transmission system or a digital broadcasting system, capable of noticing a receiver provided for viewing desired content of a channel provided for redundantly transmitting content identical to or associated with the desired content, without changing a hardware configuration and an existing transmission method.

A transmitter for broadcasting content via a specific channel, includes multiplexing means for multiplexing in the content the product of unique prime numbers respectively added to the other channels provided in parallel with the specific channel for broadcasting another content identical to or associated with the content to make it a target of the broadcasting.