To rapidly and accurately determine the number of workers necessary for cooking work.

In a cooking data management server 11 including an external storage device 26 storing menu plan information including information showing the number of meals for each menu, cooking time information and menu master information, a server body 21 determines a required time necessary for cooking based on the menu plan information, the cooking time information and the menu master information stored in the external storage device 26, and determines the number of cooking workers necessary for the cooking based on the determined required time and a predetermined limit time.