A method of assisting a user wearing a head mountable display (HMD) when determining that the user may be in a pathological state includes: detecting, by one or more sensors, one or more parameters indicating one or more current properties of the user, generating information indicating the one or more current properties of the user based on the one or more parameters, determining whether the user may be in a pathological state or a non-pathological state based on the information indicating one or more of the current properties of the user, and performing a process under instruction of a processor in response to determining that the user may be in a pathological state, the process comprising one or more operations that the user can voluntarily instruct when the user is in a non-pathological state.