To provide methods to retrieve information on opposite party whose whereabouts is desired to be confirmed when a disaster occurs and to communicate with the opposite party when a disaster occurs by utilizing a bank account of a financial institution.

In a system consisting of an automatic machine 110 of the financial institution, a disaster information center 120 of the financial institution in which a customer's bank account exists to be connected with a communication line 1000 and a disaster information center 130 in which the opposite party's bank account exists, bank account information of the opposite party whose whereabouts is desired to be confirmed which is preliminarily registered in a data storage part 122 in the disaster information center 120 of the financial institution of the customer is retrieved by reading a customer's cash card 117 is read by the automatic machine 110 and inputting a personal identification number, a call is connected with the disaster information center 130 in which the opposite party's bank account exists, information registered by the opposite party is retrieved, displayed, outputted on the automatic machine 110 and whereabouts information of the customer oneself and a message to the opposite party are registered from the automatic machine 110 to the data storage part 122.