A radio communication system for reading information codes, comprising: a first radio terminal having a first absolute ID, said first radio terminal being a portable scanner unit; and a second radio terminal having a second absolute ID, said second radio terminal being a relay unit; said first and second radio terminals (B, A) having capability of performing radio communication with each other using said first and second absolute IDs in conformity with a predetermined radio communication standard, wherein said second radio terminal has a memory device for storing a combination of said second absolute ID and a second local ID for distinction of said second radio terminal within a local area network constituted by said first and second radio terminals (B, A), said first radio terminal has capability of transmitting a search signal for searching a target radio terminal, said second radio terminal is configured to transmit, upon receiving said search signal, a response signal containing said second absolute ID, characterized in that said second radio terminal has an information item expressing said second local ID, said information item being displayed on said second radio terminal, said first radio terminal has capability of reading said information item displayed on said second radio terminal, said response signal transmitted by said second terminal contains said combination of said second absolute ID and said second local ID, and said first radio terminal is configured to validate, upon receiving said response signal from said second radio terminal, said second local ID, and to transmit a communication establishment request signal for requesting communication with said second radio terminal as said target radio terminal if said second local ID is determined to be valid by comparing said second local ID contained in said response signal transmitted from said second radio terminal with said information item displayed on said second radio terminal which is read by said first radio terminal and stored in a memory device of said first radio terminal. a first radio terminal having a first absolute ID, said first radio terminal being a portable scanner unit; and a second radio terminal having a second absolute ID, said second radio terminal being a relay unit; said first and second radio terminals (B, A) having capability of performing radio communication with each other using said first and second absolute IDs in conformity with a predetermined radio communication standard, wherein said second radio terminal has a memory device for storing a combination of said second absolute ID and a second local ID for distinction of said second radio terminal within a local area network constituted by said first and second radio terminals (B, A), said first radio terminal has capability of transmitting a search signal for searching a target radio terminal, said second radio terminal is configured to transmit, upon receiving said search signal, a response signal containing said second absolute ID, characterized in that said second radio terminal has an information item expressing said second local ID, said information item being displayed on said second radio terminal, said first radio terminal has capability of reading said information item displayed on said second radio terminal, said response signal transmitted by said second terminal contains said combination of said second absolute ID and said second local ID, and said first radio terminal is configured to validate, upon receiving said response signal from said second radio terminal, said second local ID, and to transmit a communication establishment request signal for requesting communication with said second radio terminal as said target radio terminal if said second local ID is determined to be valid by comparing said second local ID contained in said response signal transmitted from said second radio terminal with said information item displayed on said second radio terminal which is read by said first radio terminal and stored in a memory device of said first radio terminal.