PROBLEM TO BE SOLVED: To make it easy to enable another user's device to operate with the same voice input as operating own device.;SOLUTION: A management server (1) includes a relationship determination unit (111) that determines whether or not a first user who is a user of a microwave oven (4a) and a second user who is a user of a microwave oven (4b) have a predetermined relationship and an instruction unit (14) that causes the microwave oven (4b) to execute operation identified by using voice input acceptance setting of the microwave oven (4a) when the first user determined to have the predetermined relationship inputs voice to the microwave oven (4b).;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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