A method and a system for providing a service are provided. In the method for providing the service, a user terminal receives customized information among individuals or group members. The method includes: obtaining tag information by reading a tag attached to an object, the tag information containing a tag code and service data; obtaining service access information from an Object Directory Service (ODS) server when the tag is tagged in a situation, the service access information corresponding to at least one of the obtained tag information and identification information; and receiving a customized information service corresponding to the user terminal by accessing a service providing server in accordance with the service access information.