The focus detection unit 11 (an AF sensor) employs a phase difference detection method and outputs defocus amount information of a captured image to the system controller 50. The system controller 50 may control the lens unit 150 through the communication terminals 6 and 10 and performs phase difference AF based on the defocus amount information by shifting a position of the lens 103 through an AF driving circuit 3 (AF executable). An AF method may be contrast AF instead of the phase difference AF.

The imaging unit 22 is an imaging element constituted by a CCD element or a CMOS element which converts an optical image in to electric signals. An A/D converter 23 converts an analog signal into a digital signal. The A/D converter 23 is used to convert an analog signal output from the imaging unit 22 to a digital signal.

An image processing unit 24 performs predetermined pixel interpolation, a resizing process, such as size reduction, and a color conversion process on data supplied from the A/D converter 23 or data supplied from a memory controller 15. Furthermore, the image processing unit 24 performs a predetermined calculation process using data on a captured image, and the system controller 50 performs exposure control and ranging control based on an obtained result of the calculation. By this, an AF (autofocus) process employing a TTL (through-the-lens) method, an AE (automatic exposure) process, and an EF (flash preliminary light emission) process are performed. The image processing unit 24 further performs a predetermined calculation process using data on a captured image and performs an AWB (auto white balance) process employing the TTL method based on an obtained result of the calculation.