To shorten time relating to photographing by shortening the processing time required for an AE control process, so as to improve operability for photographing using flash.

A mobile phone 10 has a camera module 36 including an image sensor (52) and an exposure evaluation circuit (60). When a camera function is turned on, the image sensor (52) outputs image data, and the exposure evaluation circuit (60) performs an AE control process based on an exposure time corresponding to the luminance evaluation value of image data. In a case where surrounding is dark and illuminance for a subject is low, specifically, in a case where the luminance evaluation value of image data is lower than a predetermined value, an LED 40 is caused to emit light as a flash for photographing. At this time, the AE control process is temporarily stopped and the present exposure time is altered to an estimated exposure time. Then, the AE control process is performed having, as an initiation point for control, the estimated exposure time after the alteration. Accordingly, the time required for the AE control process is shortened.