An external apparatus function extension application system in a host computer is provided. Here, the constants L, M and N are values determined such that a slip ratio at the operation contact point is minimized. The sintered material is a CuAl based sintered material containing at least 1 to 12 wt % Sn and 2 to 14 wt % Al, and the composite sintered contact component is formed by sinter-bonding this sintered material to a metal backing. Power management information stored in a memory describes what power management is to be performed in each different operation mode.