PURPOSE: To enable plural stores to unitarily manage various kinds of information concerning sales.

CONSTITUTION: A gas station POS terminal 11 is disposed at a gas station, and a POS terminal 13 for retail store arrange in line is disposed at retail store arranged in a line to the gas stand, and they are connected to a POS unitary management part 16 by way of a communication line 15. The POS unitary management part 16 is provided with an information processing mechanism 23 processing the tabulation of proceeds, etc., in real time, a hard disk 22 storing a file such as the proceeds tabulation file 31, etc., and a control part 21 controlling each part. Thus, the respective POS terminals 11 and 13 can freely output various kinds of data inputted from mutually the other terminals and the content of the hard disk 22.