A focus evaluation value calculation unit acquires a captured image captured by an image capturing unit and then analyzes the image so as to calculate, as a focus evaluation value, a characteristic value that changes in accordance with the focus state of a video image adjusted by a focus adjustment unit. A focus evaluation value storage unit stores the focus evaluation value and a target value of a focus evaluation value. A focus state determination unit determines a display color of focus state information, which is shown as a graph with a color indicating the degree of focus. The focus state determination unit includes: a unit for calculating a change of the focus evaluation value; and a unit for determining the focus state information to be displayed by referring to a table that associates a combination of the change of the focus evaluation value, the focus evaluation value, and the target value with the display color of the focus state information.