To provide a terminal location estimation method capable of accurately estimating a location of a mobile terminal when providing information services according to the location of the terminal in a radio communication system. A maintains copies of data items and an A change count and a B change count for each data item. The method includes the following steps. By recording their contact information in the service assistance device of the present invention, HVAC contractors may increase their opportunities for receiving repeat business from customers. In a preferred embodiment, the pin-shaped section has at its arbitrary position formed with an engagement convex segment 27 adapted to engage with a corresponding engagement concave recess formed in the spinal implant 5. In this way, without changing the key layout of the preset virtual keyboard, the key position setting, and the current width of the virtual keyboard determined according to the current screen width, when the preset virtual keyboard is displayed and runs on the wide touch screen, the keys are at positions touchable by both thumbs of an operator.