A computer apparatus includes an information processing unit that processes information, a storing unit having a storage space in which the information being processed is stored, a main power supply that supplies power to the information processing unit, an auxiliary power supply including a thermoelectric element that converts heat generated in the computer into auxiliary power, and a controller that controls the auxiliary power supply to supply the auxiliary power to the information processing unit and the storing unit if it is determined that supply of power from the main power supply is interrupted, and controls the information processing unit to store the information to be processed by the information processing unit in the storing unit.