It is intended, in the mobile information terminal, to achieve compactization, cost reduction and reduction in the burden of information processing, while taking the enciphering process for the information into consideration.The cipher signal process unit for enciphering the transmission information and the cipher process selection unit for selecting whether or not to use the cipher signal process unit are provided to select whether or not to execute the enciphering of the transmission information, according to the necessity in executing the communication of information, thereby dispensing the enciphering process as far as possible and alleviating the burden of the process involved in the enciphering. Also by executing the enciphering or not respectively in case the deciphering is possible or not in the information receiving side, the cipher process means may be dispensed with in the information communication apparatus of the receiving side, whereby the apparatus of the receiving side can be made less expensive and smaller.