A stereoscopic image supplier acquires stereoscopic image data in a side-by-side layout format. An outdoor heat exchanger-side communication path 31A and an indoor heat exchanger-side communication path 31B are formed at the main valve 3. The system can be used to provide, through the earphones, sound indicative of pressure applied or not applied by a skier toward a portion of a boot while skiing. The context server receives a context request from the call destination indicating the call identification and an information template, locates the context information using the call identification, selects a set of the context information based on the information template, and transfers the selected set of the context information to the call destination. The integrally adjustable insufflation device includes one or more one fluid control mechanisms to regulate the pressure rate andor flow rate of the insufflation fluid being supplied to the subcutaneous area from within a sterile field surrounding the subcutaneous area. The second area is selected based on the number of focus detection areas satisfying a predetermined condition from among the focus detection areas each having a depth difference from the first area in a predetermined range.