A pressure plate, which is connected to a housing arrangement for rotation in common around an axis of rotation, and a force-exerting arrangement preferably a force-storing device, is supported against the housing arrangement and the pressure plate so that it can exert force on them. Vocabulary including contextual information is expanded from words occurring in first corpus of relatively small size to words occurring in second corpus of relatively large size by using a word n-gram probability estimated from an unknown word model and the raw corpus. By analyzing from a ratio in the whole reaction system, it is possible to obtain clearer results. The method includes handing-in the mobile entity from a first cell in response to adjusting the transmission power.