digital signal is received from the broadcast receiving apparatus 100 the first server 200 converts the digital signal corresponding to the user voice into text information and transmits the text information to the broadcast receiving apparatus 100 the broadcast receiving apparatus 100 performs a function based on the text information received from the first server 200 for example the broadcast receiving apparatus 100 may control an external input based on the text information alternatively the broadcast receiving apparatus 100 transmits the text information received from the first server 200 to the second server 300 if the text information is received from the broadcast receiving apparatus 100 the second server 300 generates response information corresponding to the received text information and transmits the response information to the broadcast receiving apparatus 100 here the response information may include at least one of a response text corresponding to the user voice a control signal and a content search result a response message is text information which is to respond to the user voice like having a conversation with a user for example if the user voice is u201c search for 13 u2014 u2014 u2014 u2014 u2014 u201d the response message may be text information which is to respond to a user voice like u201c i will search for it u201d the control signal is a signal which corresponds to the user voice and is to control the broadcast receiving apparatus 100 for example if the user voice is.