Disclosed herein are a method and apparatus for providing a toolbar service. The method for providing a toolbar service in a system connected to a user client via a network includes generating a file which can be edited by a user and includes at least one item information for defining an attribute of an interface displayed in a toolbar; receiving a request for download of a toolbar application from the user client; and transmitting the toolbar application including the file to the user client. The toolbar application installed in the user client updates the file according to a user's request for editing an item, parses the updated file to dynamically generate the interface of the toolbar. It is possible to provide a variety of interfaces according to a theme.