In a VoIP communication apparatus which receives a call number from one telephone device and judges whether the call number coincides with any of plural telephone numbers managed by a call server, a symbol storing section which stores respective symbol correspondence data formed by writing a distinguishable predetermined bit value into different predetermined bit positions corresponding to respective symbols used for expressing the telephone number; a number scope storing section which stores respective figure correspondence data each formed by writing the predetermined bit value into at least one the same predetermined bit position corresponding to more than one usable symbol on corresponding figure; and a collating and judging section which respectively collates the symbol correspondence data corresponding to the symbols on respective figures in the call number with the figure correspondence data of the same figure and judges whether the call number is contained in these telephone numbers are provided.