PURPOSE : To surely prepare an insurance application form or an insurance contract certificate without fail by considerably improving efficiency and saving labor for preparing the fire insurance forms in real estate business. CONSTITUTION : This device is provided with a real estate information storage part 2 for storing real estate article information such as empty rooms, insurance information storage part 3 for storing the format of the fire insurance form such as the application form of the fire insurance, control part 4 with a built-in processing program to define information such as the address of the real estate article or data such as the address of a real estate purchasing person or a barrowing person as insurance information from the real estate information called from the real estate information storage part by writing them in a memory area corresponding to the information such as the target address of the fire insurance of the format of the fire insurance form or the address of an insurance contract person stored in the insurance information storage part 3, set information storage part 5 for storing information required for setting the fire insurance contract such as insurance contract regulations, calculation part 6 for calculating insurance expanse, printer 7, and CRT display part 8.