Understanding the user’s situation is very important in the design process. There are many ways to understand a user’s situation – a designer might observe a user’s situation or a user
might record their own situation in Human Centered Design (HCD) file. However, the latter of these methods has not been very popular mainly because of the burden it place on the users. This research proposes a new smartphone-based design support application, named “HN camera”, which can be used to record the users’ situation, without any additional burden on them. This application is based on the ‘Extended Alethic/Deontic/Temporal (ADT) model’ concept. A user or a designer can understand and record the user’s situation based on the Physical factor, the Kansei factor, and the Cultural factor using HN Camera. The application was used in visualizing and analyzing tourists’ travel as a service design. Through this, the effectiveness of the proposed application was clarified.