A control device includes a communication interface that receives input data from a terminal device of a first member who is a member of a first family staying in a vehicle, the input data indicating a family composition and a family stress for the first family. A processor of the control device searches a database in which data indicating the family composition and the family stress for each of a plurality of families staying in individual vehicles is registered, using the input data received by the communication interface as a search key, selects a second family from the families based on a search result acquired, and causes the communication interface to transmit notification data that notifies the first member of information for establishing a relationship with a second member who is a member of the second family selected.