1. An information processing apparatus comprising: an image sensor operable to capture an image of an eardrum; a temperature sensor; and a central processing unit (CPU) operable to: acquire image information regarding the eardrum from the captured image of the eardrum; determine a first area corresponding to a temperature measurable area of the temperature sensor in the captured image; determine a second area occupied by the eardrum within the first area corresponding to the temperature measurable area of the temperature sensor based on the acquired image information; calculate an eardrum occupancy rate, wherein the eardrum occupancy rate represents a ratio of the second area to the first area; acquire a temperature, within an external ear canal including the eardrum, measured by the temperature sensor; and determine a temperature of the eardrum based on, the calculated eardrum occupancy rate, and the acquired temperature.