To solve the problem of the risk of acquiring control information by mistake according to a decision by mistake when control data including a mistake beyond correcting ability is received due to a drop in receiving electric field strength by fading or the like, since a decision is made by using only error detecting data when the control information is acquired in a receiver of a data transmission apparatus.

The error control information can be prevented from being acquired by acquiring the control information by using mistake decision information using error correction and the error detection of control data, receiving electric field strength information and the mistaken decision information of a synchronous word.