Method for executing application and apparatus therefor

A device for executing an application comprising a graphics user interface (GUI) for receiving an input value of an input field, the device comprising:

• a communication unit:
• an audio output unit;
• a user input unit receiving a user input to request execution of the application;
• and
• a control unit configured to:
• output through the audio output unit a first audio signal indicating a first induced inquiry corresponding to a first input field among a plurality of input fields when the user input is a voice input, wherein. the plurality of input fields include an essential input field and an additional input field, and the first induced inquiry is only generated for the essential input field;
• receive a first voice input indicating a response to the first induced inquiry,
• control the communication unit to transmit, to a server, identification information of an application, identification information of the plurality of input fields, at least one second value inputtable to the essential input field and identification information of a page including the plurality of input fields;
• control the communication unit to receive, from the server, at least one third value inputtable to the essential input field:
• detect a value for a second input field which is an essential field from the received first voice input;
• set a first input value for the second input field based on the detected value and the at least one third value;
• set a second input value for the additional input field to a preset default value, and execute the application by outputting a second audio signal indicating a second induced inquiry corresponding to a third essential input field for which a third input value is not set among the plurality of input fields.