Process system and operation method thereof

A process system comprising:

• a target substrate;
• a plurality of first substrates arranged at predetermined intervals along a first column which is parallel to an edge of the target substrate, each of the plurality of first substrates including a plurality of first chips;
• a plurality of second substrates arranged at the predetermined intervals and at an offset from the plurality of first substrates, along a second column which is parallel to the first column, each of the plurality of second substrates including a plurality of second chips;
• and
• a roller configured to:
• roll in a first rotational direction to pick up the plurality of first chips included in the plurality of first substrates,
• pick up the plurality of second chips included in the plurality of second substrates by rolling in the first rotational direction such that a group of the second chips picked up from a second substrate, from among the plurality of second substrates, is positioned on the roller between two groups of the first chips picked up from the plurality of first substrates, and
• transport the plurality of first chips and the plurality of second chips to the target substrate.