An integrated circuit apparatus includes transmitting circuits TX1 to TX64, which output transmission signals with regard to channels CH1 to CH64 of an ultrasound transducer device which has a plurality of ultrasound transducer elements, and a switching circuit which performs a switching operation. The switching circuit is provided between a receiving circuit and output nodes NQ1 to NQ64 of the transmitting circuits TX1 to TX64. Then, an operation is performed where the signal transfer of the transmission signal from the transmitting circuits TX1 to TX64 to the receiving circuit is set to be not transferred in a transmitting period. A switching operation is performed where the reception signals from the channels which are selected from among the channels CH1 to CH64 are output to the receiving circuit in a receiving period.
