Information processing apparatus and operation method of information processing apparatus

An operation method of an information processing apparatus including an apparatus body including a body having a keyboard and a display attached to each other to be opened and closed, an acceleration sensor mounted on the apparatus body, circuitry to determine a user gesture event executed with respect to an axis superimposed on and extending along an attachment point of the display unit and keyboard of the apparatus body and to execute a given operation corresponding to the gesture event, the method comprising:

• determining, in the circuitry, a reference posture of a holding state of the apparatus body taken when the user executes a given gesture while holding the apparatus body based on acceleration detected;
• determining, in the circuitry, the gesture event executed by the user by comparing posture change of the apparatus body from the reference posture to a predetermined threshold;
• and
• executing, in the operation execution unit, an operation corresponding to the determined gesture event executed by the user
• wherein the given gesture is a page turning gesture identified by the circuitry based on an angle between the keyboard and display while the apparatus body is in a portrait orientation, and the operation is a page turning operation.