1. A schedule management system using an interactive robot, the schedule management system comprising the interactive robot audibly communicating with a user, wherein the interactive robot includes: a conversation management unit to determine whether reasoning is performed to obtain schedule information to be provided to the user without a request from the user for a schedule recommendation and to control an operation to audibly provide the obtained schedule information to the user; a reasoning unit to perform the reasoning using information collected by the interactive robot to obtain the schedule information when it is determined that the reasoning is to be performed, and to provide the obtained schedule information to the conversation management unit; and a reasoning weight storage unit to store the reasoning weights indicating reasoning appropriacy of schedules which are used by the conversation management unit to determine whether the reasoning is performed.