To make the period of a deposit balance long and to stabilize it by providing service information for the customer in return for depositing.

A contents distributing server 3 is installed in a financial institution A and stores various service information corresponding to deposit amounts and deposit periods and distributes service information corresponding to a deposit amount in response to a distribution command, and a gateway device 3 for network banking in the financial institution A accesses an accounting system host 5 to make a comparison with the deposit balance about whether or not the deposit amount and deposit period satisfy the condition of the provision of service information at a request to obtain specific service information corresponding to the deposit amount and deposit period from a depositor terminal device 1 through the Internet 2 and outputs the distribution command for distributing the specific service information corresponding to the deposit amount and deposit period that the depositor requests to the contents distributing server on condition that the deposit balance and deposit period of the deposit meets the condition.