A control device includes: a storage that stores a dialog model in which a question to a user, a reply candidate to the question from the user and a control content of each electronic device are associated with an input query from the user; an acquirer that acquires environmental data in a surrounding of the user; a calculator that, based on the environmental data, calculates environment predicted data to predict environment in the surrounding of the user after elapse of a predetermined period of time in cases where each control content corresponding to the input query is executed; and a question selector that selects a question corresponding to the control content that maximizes data indicative of a degree of comfort of the surrounding environment of the user in cases where each control is executed based on the environment predicted data.