The present invention is designed so that adequate communication is allowed even when system information is changed. The present invention provides a receiving section that receives a DL signal, which includes information that orders a modification of system information, and a control section that controls the modification of the system information based on the DL signal, and, when information related to content of the modification of the system information is included in the information ordering the modification, the control section changes a part or all of the system information based on the information related to the content of the modification. Also, in the modification order information, information to indicate that the system information is not changed and information to indicate the content of the modification when the system information is changed are defined as different pieces of bit information in the same bit field.