System for processing user utterance and controlling method thereof

A system comprising:

• a communication interface;
• at least one processor operatively connected to the communication interface;
• and
• at least one memory operatively connected to the at least one processor,
• wherein the at least one memory stores instructions that, when executed, cause the processor to provide:
• an automatic speech recognition (ASR) module;
• and
• a plurality of natural language understanding (NLU) modules that operate independently of one another,
• and further cause the processor to:
• receive first voice data including a first user utterance via the communication interface;
• process the first voice data using the ASR module to generate first text data;
• process the first text data using a first NLU module of the plurality of NLU modules into a first intent and one or more context information items associated with the first intent, wherein the one or more context information items are information obtained from the first voice data that and are distinct from the first intent;
• provide a first response via the communication interface, based on the first intent and the one or more context information items;
• and
• provide at least part of the one or more context information items to at least one other NLU module of the plurality of NLU modules to allow the at least one other NLU module to provide at least one response based on the one or more context information items.