An automated apparatus for determining the calorific value of combustible substances employs an integrated, isothermal water reservoir to reduce the complexity of the apparatus and facilitates automation of the calorimeter by providing a convenient source of isothermal water. The detection Hall element has a characteristic, which is almost a same as the temperature monitor Hall element. The data access request includes a source path tag and a target address. Labels are next ordered by priority in descending importance. The display controller includes an object generation module configured to generate an object representing an operation button for activating a function of the another electronic apparatus with one operation and to arrange the generated object on the operation screen, when the determination module determines that the function is activated through a plurality of operations.