A household budget book service system using mobile terminals is disclosed. The household budget book service system includes a master mobile terminal having budget book indexes for inputting a user's expenditures, capable of storing and sending any inputted expenditures, and receiving expenditures inputted in mobile terminals of the user's other family members that have been registered for integrated management of overall household expenditures, a budget book management server for receiving the expenditures inputted in the master mobile terminal and those inputted in each other family member's mobile terminal to control the operation of the master mobile terminal and capable of communicating with any card company's server and any bank's server, and a storing section connected to the budget book management server to store information sent from each mobile terminal according to the budget book indexes.