A terminal device comprising: a display unit having light permeability; a controller; and a storage unit, wherein the controller comprises: an acquiring unit configured to acquire a target image (90, 110) captured by an image capturing unit and feature information indicating a feature of an environment of the terminal device at a target timing when the image capturing unit performs image capture of the target image (90, 110), wherein the feature information indicating the feature includes a feature element included in the target image (90, 110) captured by the image capturing unit at the target timing; a storage controlling unit configured to store the target image (90, 110) and the feature information that were acquired in the storage unit in association with each other; characterized in that, the controller further comprises: a display controlling unit configured to cause the display unit to display the target image (90, 110) stored in the storage unit in association with the feature information indicating the feature including the feature element for comparing the target image (90, 110) with a current state, which can be directly seen through the display unit, existing behind the target image therethrough at present, in the displaying unit, in a specific case where image capture of the feature element by the image capturing unit is detected after the target image (90, 110) and the feature information have been stored in the storage unit. a display unit having light permeability; a controller; and a storage unit, wherein the controller comprises: an acquiring unit configured to acquire a target image (90, 110) captured by an image capturing unit and feature information indicating a feature of an environment of the terminal device at a target timing when the image capturing unit performs image capture of the target image (90, 110), wherein the feature information indicating the feature includes a feature element included in the target image (90, 110) captured by the image capturing unit at the target timing; a storage controlling unit configured to store the target image (90, 110) and the feature information that were acquired in the storage unit in association with each other; characterized in that, the controller further comprises: a display controlling unit configured to cause the display unit to display the target image (90, 110) stored in the storage unit in association with the feature information indicating the feature including the feature element for comparing the target image (90, 110) with a current state, which can be directly seen through the display unit, existing behind the target image therethrough at present, in the displaying unit, in a specific case where image capture of the feature element by the image capturing unit is detected after the target image (90, 110) and the feature information have been stored in the storage unit. an acquiring unit configured to acquire a target image (90, 110) captured by an image capturing unit and feature information indicating a feature of an environment of the terminal device at a target timing when the image capturing unit performs image capture of the target image (90, 110), wherein the feature information indicating the feature includes a feature element included in the target image (90, 110) captured by the image capturing unit at the target timing; a storage controlling unit configured to store the target image (90, 110) and the feature information that were acquired in the storage unit in association with each other; characterized in that, the controller further comprises: a display controlling unit configured to cause the display unit to display the target image (90, 110) stored in the storage unit in association with the feature information indicating the feature including the feature element for comparing the target image (90, 110) with a current state, which can be directly seen through the display unit, existing behind the target image therethrough at present, in the displaying unit, in a specific case where image capture of the feature element by the image capturing unit is detected after the target image (90, 110) and the feature information have been stored in the storage unit.